After Mario and Meggy got the special Darkness 0 was in a room that was completely sealed off that was labeled project black and zero was taking notes

Zero: so far the specimen has yet shown in any reaction however ever since that special Darkness with the combination of me and nines power seemed with condom down... how do I petition to have more personality than the evil he was acting.

???: what are you going to do to me?

Zero: I'm here to make sure you are okay... I'm was worried about you said you were acting not like yourself.

???: I'm sorry it's just that when you leave me alone by myself I don't know what happened feels like I become a whole completely different person or someone took over.

Zero: it's okay I forgive you it's my fault for leaving you guys alone for so long things just went crazy in the negative universe.

???: when can I meet the Starchild and friends of yours to keep talking about?

Zero: I'm sorry but I fear if you are to fall into the wrong hands or somebody I... do not want that to happen to you which is why I keep you here to be safe... and I please get some rest I'm going to stay with you all day tomorrow.

???: okay zero good night.

??? Went to sleep and zero went to the room in his lab to sleep and the next day zero woke up made himself breakfast and got ??? Breakfast ready

Zero: it's time to get up.

???: dark and light energy my favorite.

Zero: so far still seems to prefer to combined the light and dark energy to eat... nine doesn't know why I keep taking some of his light energy I told him it's for the experiment he just believes anything I tell him but the others they constantly ask me why do I spend so much time in my lab and mostly with project black but... they well know when the time is right I hate Keeping Secrets From My Friends my brother and even my girlfriend but this is for their own good.

???: so what are we going to do this time zero?

Zero: I'm going to do an energy scan see how your body is holding up to the special dark energy you've eaten I used to make that cure.

Computer scans ??? powers and personality all show normal

Zero: that's weird that you look completely different when you attack me whatever that was hope it's gone but I don't know if they'll come back or not so far what I gave you since we can tanning it for now but all eventually wear off. but in the meantime let's get to work...just stay here until I come back ok.

???: Zero I got a question do I have name or family?

Zero: of course you do your name is Black Star and you have seven older brothers of course they don't know of you until the time is right but don't worry I'm sure they going to love you when they meet you.

Black star: so my name is Blackstar I did a feeling you just made that name.

Zero: you don't get to question my naming... now wait here until I come back I got to go get a get a few things.

Zero up outside of the room labeled project black and leaving the door and when he went upstairs to the castle nine walk in

Nine: hey zero I got a question for you... the room to project blacks finally open... well I guess a quick peek and wouldn't hurt now will it.

Nine walked in the room and black star was hiding behind a lamp

Black star:(scared)Who are you and how you get in here please don't hurt me?!

Nine:Hey it ok I'm not gonna to hurt.

Black star came out of behind the lamp and Nine hugged him out of joy

Nine: you're kind of small compared to other stars I've seen... but this place looks boring what are you even doing here?

Black star: well not that usually I play,eat and just sleep also talk to zero sometimes.

Nine: is that all... man my brother doesn't do anything good on his own.

Black star: now I know why your name is familiar zero told me about you you're his little brother.

Nine: little brother?!.... did he tell you that he was in like 2 seconds older... anyways you need out to the castle we go.

Black star: zero says I'm not allowed to leave this room.

Nine: don't worry just do what me and Mario do what he doesn't know won't hurt him.

Black star: okay I guess?

Nine picks up black star and starting to walk out of zeros lab and into the castle main room where everyone but zero was there

Meggy:Hey Nine did you ask zero the question you want to ask him?

Nine: no but I found somebody who you should all meet... say hello to Black Star!

Mario: star I haven't seen one sentence Turlandb visit us and showed us those seven Elemental Stars.

Nine: well I think this is Project black that zeros been working on this whole time.

SMG4: you me the time of this whole time he's been working on a star what a waste of time.

Nine: coming from the one who takes weeks to finish an arc.

Mario: you just got roasted smg4.

Luigi: anyways why would zero keep him a secret?

Black star: he is constantly running tests on me saying that there's some kind of it like dark parasite inside of me that seems in removable I don't know what it is but I heard him talking to a Starchild name Turlandb I think.

Nine: so him and Turlandb knew about you.

Black star: I don't know but one day they were talking something about alloy?

Tari: what does Alloys have anything to do with it?

Nine: well according to Ink Sans who is one of my AU Traveler AKA alternate universe Traveler said that Turlandb Elemental stars have something called Dark Alloys in them I don't exactly know what they are... wait what type of star are you?

Black star: he said an elemental star why?

Mario: the same Elemental stars that completely tore Destroyer apart when he was useing 10% of his power.

Nine: yep those very same Elemental Stars.

Zero walked into the castle main room with a bag full of Machinery parts

Zero: what's everyone doing here...

Sees Nine holding black star

Zero: why are you not in the room label project black I said not to leave.

Black star: sorry zero it's just that nine say would be okay if....

Zero: dammit Nine this is exactly why I don't trust you with anything!

Nine: you can't blame me for locking up a star in in a room for no reason!

Zero: first of all he's just a few days old he doesn't know much and you let him out of the room!

Nine: oh so now you admitting that you're having a kid locked up!

Both looked at each angrily

Mario: hey hey calm down you two.

Tari: yeah the last thing we need is for you to make a wreck of the castle again.

Meggy: zero why exactly does he have to stay in that room?

Zero: that room is like a mini star Heaven area only it affect it's made specifically to contains black stars so-called dark alloy.

Nine: big deal with the dark aloe going to do bring the end of the world!

Zero: if he unites with the other dark Alloys then yes it will be!

Nine: well he's not and you don't have to keep in that room 24/7 you know!

Black star started to hide behind Mario and Meggy and Maggy started to get annoyed

Meggy:(annoyed) both of you stop your scaring black star!!!

Both brothers look at eachother angrily

Zero and Nine: fine...

Tari: thank goodness for a moment there I thought things were going to get worse.

SMG4: so zero why were you gone anyways?

Zero: I have to get some parts to fix the BattleBots they've been malfunctioning lately.

Black star: your friends are really nice I don't know why you didn't want me to meet them?

Zero: the only one's I don't want you around is Bob Mario and nine.

Mario: hey!!

Bob: I'lL hAvE yOu KnOw ThAt I aM oNe oF tHe BeSt PeOpLe To bE aRoUnD!

Nine: and what about all the good things we done for you like lifting after your lab why you went on a date with Lucy.

Zero flashback

Zero: are you sure I can trust the three of you?

Nine: don't worry you'll laugh you'll be perfectly safe just enjoy your date with Lucy already.

Zero and Lucy come back from the date to see zeros lab a complete wreck

Nine,Mario and Bob: he did it!!

Zero flashback ends

Zero: I think now I remember why E Gadd doesn't allow Mario and his lab... but you're right I can't keep black star in that room anymore so I will allow him some free passage however he cannot leave the castle too far I still have yet to know what he can fully do and what the heck is that Dark alloy he keeps talking about.

Nine: don't you just ask spirits Star?

Zero: yeah I don't think I'll be too happy on that.

Mario: you know what this means we've got a new friend!

Mario started to dance happily with Nine

Zero: I swear you guys are going to be the death of me.

(Nine: and so a new member to the cast of been added this took longer than expected hope you all enjoy the new member and I'll see you all next time later!)