Undertale:

Oc name: Blue Moon

Theme song:

https://www.youtube.com/watch?v=95E8_pftDnY

Reason:
It already says it in the song-

Undersail:

Oc name: Teal Ocean

Theme song:

https://www.youtube.com/watch?v=-u5gDCNwTiw

Reason:

I honestly don't know I just think it suits her-

Underfell:

Oc name: Red Moon

Theme song:

https://www.youtube.com/watch?v=g9KIYYJJ0v0

Reason:

She gets called out names a lot and gets beaten up back when she was still in highschool and still is today so she's describing everyone a 'kid' and she's probably to scared to have a child-

Inktale:

Oc name: Paint

Theme song:

https://www.youtube.com/watch?v=LS2ifrLAadU

Reason:

Everyone she used to love left her alone and now she's asking for the one's she loves to Stay especially Error and Ink

Dancetale:

Oc name: Disco (it used to be hop but I decided to change it-)

Theme song:

https://www.youtube.com/watch?v=vu9mAAr1pBI

Reason:

You'll DEFINITELY need this girl to be in ur party- she can hype anything up-

Errortale:

Oc name: Exe

Theme song:

https://www.youtube.com/watch?v=kpSXc1sLa2k

Reason:
It just sounds right for her-

Aftertale:

Oc name: Cide

Theme song:

https://www.youtube.com/watch?v=J6enOG547lk

Reason:

No she did not get cheated on- she was just betrayed by her best friend, Reaper-

Sugartale:

Oc name: BonBon

Theme song:

https://www.youtube.com/watch?v=DZ2E9L0Rwms

Reason:

:D

Outertale:

Oc name: Stella

Theme song:

https://www.youtube.com/watch?v=gf0408sJzAQ

Reason:

This is just based off on her and Outer sans's relationship (yes I'm a fangirl but I ain't a yandere-)

Mafiatale:

Oc name: Mary

Theme song:

https://www.youtube.com/watch?v=gphlDL3p_M4

Reason:

This just fits her-

Ok that's all- these songs ain't mine k? And that's they're cannon voices-
Except for Red Moon's-