which characters should I have in my When 《嗜血法医》 met Dexi doujinshi?

I already have the ones listed below, but I need 更多 because I'm changing a the plot line a bit, the 列表 below that is characters I'm considering.

Character already in:
Dexter
DeeDee
Dexi
DoDe
Blossom
Bubbles
Buttercup
The rowdyruffs
Mandark
Olga
Otto
Mandarkina
Mandy
Billy
Grim
Princess
Him
Mojo jojo
The proffesor
Ms. Bellum
Sammy
and........that's it, heres the ones i'm suggesting putting in......

May put in:
Bell
Gir
Loga (sammy's little brother, guy version of Olga)
Ottie ( Dexi's best friend, girl version of Otto)
Mandarin ( male version of mandy,Dexters cousin)
Biley ( sounds like "miley" with a B. girl version of Billy, best friend of Mandarin)

short lists for both, any suggestions can be made, though I can say most likely Gir, loga,and Ottie will be put in the story, the rest of them I dunno yet.