Made an OC, Stranger, who wanders around and explores the Underground.

She is a dragon hybrid with the top half of her face a skull.

She does have some powers and uses them for easy traveling experiences.

Having a very preppy, curious personality she likes talking to others around the towns.

When she first meets the main character, Frisk, she is wearing her usual attire. Stranger leads Frisk towards her destination. Stranger does befriend Frisk in their travels.

"Hey, kid. You lost?"

"Me? Lost? Please, I know this place like the back of my hand!"

In the genocide route when Stranger meets Chara and finds out what she did to Papyrus she does attempt to fight her.

In this situation, Stranger appears very gruff and beaten up. She has a torn look on her face and is crying.
Her skull shows more cracks then before.
Stranger holds a purple staff studded with green crystals. Around her neck and wrists are purple bands also studded with green crystals. Stranger uses her magic from the crystals to attack Chara.

Green is also the color of her soul.

"Why did he deserve to DIE? Why....why did he.....why did you..."

"The only place you'll be going -after I'm done with you- is hell."

When defeated:

"Well...this is it. My journey stops here."

Eh, why not here's her theme song.

https://youtu.be/q6PTZED2fek