Basically, here are songs that I associate with my OC's! :>

• Once upon a time (a Undertale nursery rhyme)
Delia and Dusk

When she was a kid, before the lab, Dusk had sung this nursery rhyme to Delia. Delia didn't really understand everything, so she innocently sang along, the two clapping in rhythm and performing hand motions.

• Lyrics and hand motions:

Delia and Dusk are normally clapping:
Every good rhyme starts with ''Once Upon A Time''!
Long ago, far away,
centuries before our day...
Humans lived, monsters roamed.
Both shared earth and sky as home.
Yet this peace came undone...
War was waged and humans won.
Forced below, monsters fell.
Humans trapped them with a spell.
Listen, chlidren, to my words:
Ebott will eat you, beware the curse!
Monster teeth go: clack, clack, clack...
If you climb the mountain, you won't come back!
Human child, human child, won't turn around.
Human child, human child- oops, they fell down!
Human child, human child, look out below... down underground where the monsters go.
Oops, dropped your heart...
They clench fists, bring their hands down and open their hands again
Be careful in the dark.
They cover their eyes
Someone might take it, break it apart.
They make a heart with their hands, then move hands apart
Trouble on the left...
They look to the left
Trouble on the right...
They look to the right
Will you spare them,
They hold hands out in a peaceful gesture
Run,
They bring arms up to their chest, like a shield
Or fight?
They punch air
Then they repeat everything, whispering:
Oops, dropped your heart...
Be careful in the dark.
Someone might take it, break it apart.
Trouble on the left...
Trouble on the right...
Will you spare them, run, or fight?

• Song:

If she hears this rhyme again, Delia will freeze and finish the lyrics automatically, but she will be very disturbed.

• The Corpse dance/Shikabane no Odori (Kikuo)
Dusk control song

Dusk has the power to temporarily control people if she sings a song. This song is a Japanese song named "The corpse dance". The lyrics are obviously in Japanese, so I'm going to translate :D
(No, I don't know Japanese so I'll be translating with a English cover of this song...)

• Lyrics translated

Let's follow the lead of the corpses and dance!
♪
The corpse dance!
♪
Let's follow the lead of the corpses and dance!
Twitching in the night, twitching the in night
Twitching in the night, full of fright but
Unable to fight whatever's possessing me
Misery, misery
Misery will be the
The guide for me as I step down this path, the fallen tread
See the carcasses that swing and sway...
Hypnotize and twist your thoughts away, paparapara~

Hear it loud and clear, the crows are cawing, lend an ear
Don't you shed a tear, oh brother, sister, come here
Come join this wonderful, wonderful, paradise, paradise lost~
Come and dance?

The corpse dance!
The corpse dance!
Living is only delaying your decaying
Sing with glee, the rotting beat will penetrate your heart and carry in the gaping hole, it brings a very merry tune
This is a time for joy, a time for fun, a time to sway!
Come and join us all
Our bonds won't ever fade
So make haste before the evil demons take your place
Come, and let us sway and dance the night away
Cha cha woo~!

♪
So that you may sway the right way-
So that you may sway the right way-
So that you may sway the right way-
Meed the words I say
Spilling just a little lot of blood
Just a drip and drop begin to flow
And then you're ready

Let the hatred that you hold in your heart fuel your pain
Send your soul, release your thoughts spinning in your brain
Step forward:
One more...
One more...
One more...
Come and join me...
COME AND DANCE~!

The corpse dance!
The corpse dance!
Dear child, worry not, for hell will be your home
Oily lipids in the folds of your brain flow like rotting rivers out your nose and waterfalls fall to the hallowed ground
The corpse dance!
The corpse dance!
Living is only delaying your decaying
Sing with glee, the rotting beat will penetrate your heart and carry in the gaping hole, it brings a very merry tune
This is a time for joy, a time for fun, a time to sway!
It isn't hard to see that you deserve to stay...
So make haste before the evil demons take your place
Come and let us sway and dance the night a-
Let us sway and dance the night a-
Let us sway and dance the night away!
Cha cha woo!~

♪
The corpse dance!
♪

The corpse dance!
This is a time for joy, a time for fun, a time to sway!
Come and join us all
Our bonds won't ever fade
So make haste before the evil demons take your place
Come and let us sway and dance the night a-
Let us sway and dance the night a-
Let us sway and dance the night away!

• Original song:

• A part of Mockingbird (Eminem)
Evan

Evan isn't introduced yet. So let's put it in context:
Evan is a single dad, he has a 2 year old daughter named Mia and a 4 year old son named Noah. No one knows he has children. They are poor and live in a small and dirty apartment.
Evan, ready to do absolutely anything to make his kids smile and get them out of misery, has been hired for a job... Hitman. He works at night.
Every night, to calm and put the kids to sleep before he leaves, he sings this song to them.

• Lyrics

Now hush, little baby, don't you cry
Everything's gonna be alright
Stiffen that upper-lip up, little lady/man, I told ya
Daddy's here to hold ya through the night
I know mommy's not here right now, and we don't know why
We fear how we feel inside
It may seem a little crazy, pretty baby
But I promise, momma's gon' be alright
And if you ask me too:
Daddy's gonna buy you a Mockingbird
I'ma give you the world
I'ma buy a diamond ring for you, I'ma sing for you
I'll do anything for you to see you smile
And if that Mockingbird don't sing, and that ring don't shine
I'ma break that birdies neck
I'd go back to the jeweler who sold it to ya
And make him eat every karat, don't fuck with dad!
Haha...

• Song:

• Boyfriend (Dove Cameron)
Naeva

Basically, Naeva sang this song to Miss Pauling to seduce her. The "he" refers to Scout.
(Naeva X Miss Pauling, yes.)

• Lyrics

I can't believe we're finally alone
I can't believe I almost went home
What are the chances? Everyone's dancing
And he's not with you...

The universe must have divined this
What am I gonna do? Not grab your wrist?

I could be a better boyfriend than him
I could do the shit that he never did
Up all night, I won't quit
Thinking I'm gonna steal you from him
I could be such a gentleman
Plus all my clothes would fit

I could be a better boyfriend
I don't need to tell you twice
All the ways he can't suffice
If I could give you some advice
I would leave with me tonight

The universe must have divined this, mmm, mmm~
Ladies first, baby, I insist

I could be a better boyfriend than him
I could do the shit that he never did
Up all night, I won't quit
Thinking I'm gonna steal you from him
I could be such a gentleman
Plus all my clothes would fit

I could be a better boyfriend than him

I could be a better boyfriend

I never would have left you alone
Here on your own glued to your phone
Never would have left you alone
For someone else to take you home

I could be a better boyfriend than him
I could do the shit that he never did
Up all night, I won't quit
I'm gonna steal you from him
I could be such a gentleman
Plus you know my clothes would fit

I could be a better boyfriend than him
I could do the shit that he never did
Up all night, I won't quit
Thinking I'm gonna steal you from him
I could be such a gentleman
Plus all my clothes would fit

• Song:

• Freakshow (Sub Urban feat. REI AMI)
Delia

Delia heard this music at the lab. Growing up, in the lab, she hummed it or sang it softly all the time while training, or in her cell. Especially some parts.
(I would put those parts in bold AND italics)

• Lyrics

Welcome to our freak show, come meet my monsters
Oh, such a fine collection of stranger things...

My patience running thinner on this melting clock
Cerebrum jailed with thoughts most would consider rot
To think you're any different from an animal
A creature sick as you should be put down
But I can't help myself...

Ooh-na-na-na-na, ooh-na-na-na-na~
Ooh-na-na-na-na, ooh-na-na-na-na~

Welcome to our freak show, come meet my monsters
Oh, such a fine collection of stranger things...

Please, don't hide your imperfections
Nature took two tries to make the man in white
No, I don't mind, you are a beauty
Not temptation, you're my creation...

Freak o' Friday night, know I'm the main attraction
Basket acrobat, they wanna see some action
Tinkering with my design, twist and tame my feral mind
Play with me 'til you've found another toy...
Let me be your freak show, I could be your favorite monster?
Rattle my whole cage, remind me why I can't be fostered
Let me be your freak show, I could be your favorite monster?
Lock me up, don't let me out 'cause you know I can't help myself...

Ooh-na-na-na-na, ooh-na-na-na-na~
Ooh-na-na-na-na, ooh-na-na-na-na~

Welcome to our freak show, come meet my monsters
Oh, such a fine collection of stranger things...

You're wasting, you're wasting all
Of your time finding a cure when there's no disease
You're wasting, you're wasting all
Of your talent on an audience that sees a freak

Ooh-na-na-na-na, ooh-na-na-na-na~
Ooh-na-na-na-na~

Can't help myself...

Welcome to our freak show, come meet my monsters
Oh, such a fine collection of stranger things...

Again, like with the nursery rhyme, if she hears this again, she will freeze and finish the lyrics automatically, but WAY MORE disturbed.

• Song:

• Brother (Kodaline)
Ava and her older brother, Aidan

Everyone thinks that Aidan is dead, and Ava too. She remembers that Aidan always sang that song to her, so when she feels lonely, she grabs a photo of him and sings this softly.

• Lyrics

When we were young we were the ones
The kings and queens oh yeah, we ruled the world
We smoked cigarettes, man, no regrets
Wish I could relive every single word

We've taken different paths
And travelled different roads
I know we'll always end up on the same one when we're old
And when you're in the trenches
And you're under fire I will cover you

If I was dying on my knees
You would be the one to rescue me
And if you were drowned at sea
I'd give you my lungs so you could breathe

I've got you, brother...
I've got you, brother...
I've got you, brother...
I've got you, brother...

Oh brother, we'll go deeper than the ink
Beneath the skin of our tattoos
Though we don't share the same blood
You're my brother and I love you that's the truth

We're living different lives
Heaven only knows
If we'll make it back with all our fingers and our toes
Five years, twenty years, come back...
It will always be the same

If I was dying on my knees
You would be the one to rescue me
And if you were drowned at sea
I'd give you my lungs so you could breathe

I've got you, brother...
I've got you, brother...

And if we hit on troubled water
I'll be the one to keep you warm and safe
And we'll be carrying each other
Until we say goodbye on our dying day

Because I've got you brother...
I've got you, brother...
I've got you, brother...
I've got you, brother...

If I was dying on my knees
You would be the one to rescue me
And if you were drowned at sea
I'd give you my lungs so you could breathe

Oh, oh, oh, oh, oh, oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh, oh, oh, oh, oh, oh
I've got you, brother...
I've got you, brother...

• Song:

• Some say (Nea)
Leyina (not introduced yet)

Leyina is currently what we can call Ava's best friend. BUT IN THE FUTUR, she will also develop feelings for Ava, but Ava is afraid of love. So Leyina will wait, and she will always sing this song the night, while waiting for Ava to be ready.

• Lyrics

Hmm, yeah, yeah, yeah...

I will find the time, we will find the timing
'Cause you are on my mind, I hope that you don't mind it
You know that I want you, you know that I want you next to me
But if you need some space, I will step away

And I know it might sound stupid but for me, yeah...
I just gotta keep believing and I've heard...

Some say you will love me one day
And I will wait, I will wait to get your loving one day
Just say you will love me one day
And I will wait, I will wait to get your loving one day

I promise that I'll try, that I will try to meet someone
And there's so many guys, who told me I deserve someone
I wanna call you up but maybe it will only make it worse
I guess that I just don't know what to do with myself

And I know it might sound stupid but for me, yeah...
I just gotta keep believing and I've heard...

Some say you will love me one day
And I will wait, I will wait to get your loving one day
Just say you will love me one day
And I will wait, I will wait to get your loving one day

Ooh-ooh-ooh, ooh...
Ooh-ooh-ooh, ooh...
Just say you'll love me one day
Ooh-ooh-ooh, ooh...
Ooh-ooh-ooh, ooh...
Just say you'll love me one day

I'll give you space to the moon if it's what you need
Just say you one day will bring back yourself to me...

Some say you will love me one day
And I will wait, I will wait to get your loving one day
Just say you will love me one day
And I will wait, I will wait to get your loving one day

Ooh-ooh-ooh, ooh...
(Just say you'll love me, say you'll love me one day)
Just say you'll love me one day
Ooh-ooh-ooh, ooh...
(Just say you'll love me, say you'll love me one day)
Just say you'll love me one day

• Song:

• Angry too (Lola Blanc)
Delia

This song describe how Delia feels anger, because she can't control her emotions, especially her anger.

• Lyrics:

I buried the unseemly urges
Deep down in the ground with the roots
But it's all coming up to the surface
Maybe it's getting ready to bloom?

And I don't wanna be a monster in the making!
I don't wanna be more bitter than sweet!
I don't know how to be just standing by blankly
Not getting angry...

'Cause another and another coming up out of the gutter
'Til I'm drowning in an ocean of entitled motherfuckers
And they're pushing all my buttons
But they never seem to wonder why
Another and another, ask each other:

Does it get your blood boiling? Does it make you see red?
Do you wanna destroy it? Does it get in your head?
'Cause it gets my blood boiling, and I'm coming unglued
It would hit you like poison if you knew what I knew
You would be angry too

I'm seeing through crimson sunglasses
I'm breathing and counting to ten
I guess I'm fresh out of free passes, they'll pay if it happens again

And I don't wanna drink the venom they made me!
I don't wanna be controlled by the past!
Boy, if you were me, could you really blame me?
Would make you crazy...

'Cause another and another coming up out of the gutter
'Til I'm drowning in an ocean of entitled motherfuckers
And they're pushing all my buttons
But they never seem to wonder why
Another and another, ask each other:

Does it get your blood boiling? Does it make you see red?
Do you wanna destroy it? Does it get in your head?
'Cause it gets my blood boiling, and I'm coming unglued
It would hit you like poison if you knew what I knew
You would be angry too

"Calm down girl, why you so mad?
Why's your heart gone rotten?
It's all good, girl, why you upset?"
Guess they have forgotten what they did...

And does it get your blood boiling? And does it make you see red?
And do you wanna destroy it? Does it get in your head?
'Cause it gets my blood boiling, and I'm coming unglued
It would hit you like poison if you knew what I knew

You would be angry, you would be angry
You would be angry, you would be angry too

• Song:

• I kissed a girl (Katy Perry)
Naeva

Basically, Naeva used this song to come out as lesbian to the Red Team.

• Lyrics

This was never the way I planned...
Not my intention...
I got so brave, drink in hand
Lost my discretion
It's not what I'm used to
Just wanna try you on
I'm curious for you
Caught my attention

I kissed a girl!
And I liked it!
The taste of her cherry chapstick...
I kissed a girl, just to try it
I hope my boyfriend don't mind it...
It felt so wrong, it felt so right
Don't mean I'm in love tonight
I kissed a girl and I liked it!
I liked it!

No, I don't even know your name
It doesn't matter
You're my experimental game
Just human nature
It's not what good girls do
Not how they should behave
My head gets so confused
Hard to obey...

I kissed a girl!
And I liked it!
The taste of her cherry chapstick...
I kissed a girl, just to try it
I hope my boyfriend don't mind it...
It felt so wrong, it felt so right
Don't mean I'm in love tonight
I kissed a girl and I liked it!
I liked it!

Us girls, we are so magical
Soft skin, red lips, so kissable
Hard to resist, so touchable
Too good to deny it
Ain't no big deal, it's innocent

I kissed a girl!
And I liked it!
The taste of her cherry chapstick...
I kissed a girl, just to try it
I hope my boyfriend don't mind it...
It felt so wrong, it felt so right
Don't mean I'm in love tonight
I kissed a girl and I liked it!
I liked it!

• Song:

• Shy (Jai Waetford)
Hanae

This song describes how Hanae feels love for Toko, an OC of my best friend and brother, in a wholesome way.
(Just switch gender: "girl" become "boy")

• Lyrics:

Everytime you walk into the room got me feeling crazy
Shock my heart: boom, boom!
Any other girl (boy) would stare
But me, I look away
'Cause you making me scared...

Tryin' not to breathe: one, two, three...
Tryin' not to freak when you look at me
Gotta make a move but I freeze
You don't have a clue what you do to me...

Boy (girl), you make me shy, shy, shy
You make me run and hide, hide, hide
I feel like I get lost in time
Whenever you near me
Boy (girl), you make me shy, shy, shy
I'm fightin' butterfli-fli-flies
Yeah, you make me lose my mind
Whenever you near me
Boy (girl), you make me shy...
Oh...

Rejection is a word that I don't wanna know
But a boy (girl) like you could kill a girl (boy) real slow
A million words stuck up in my head
Waiting to be said, but my tongue is stumbling!

Boy (girl), you make me shy, shy, shy
You make me run and hide, hide, hide
I feel like I get lost in time
Whenever you near me
Boy (girl), you make me shy, shy, shy
I'm fightin' butterfli-fli-flies
Yeah, you make me lose my mind
Whenever you near me

Boy (girl), you take me high~
I feel like I can fly~
But I fall out of the sky...
When I look into your eyes
Oh, oh...

Boy (girl), you make me shy, shy, shy
You make me run and hide, hide, hide
I feel like I get lost in time
Whenever you near me
Boy (girl), you make me shy, shy, shy
I'm fightin' butterfli-fli-flies
Yeah, you make me lose my mind
Whenever you near me

Boy (girl), you make me shy
Yeah, yeah, yeah, oh
Boy (girl), you make me shy
Can't even talk to you
Boy (girl), you make me shy...

• Song