Basically what I think their theme songs could be

So here

Tommy: Goodbye Chainsaw by KurageP ft. Yuzuki Yukari

Ash: The Pokémon Theme Song (English version)

Ed: Train Wreck by James Arthur

Annabeth: Demons at the Door by Sleeping Wolf

Minami: TBD

Nishinoya: You're Gonna Go Far, Kid by The Offspring

Sky: Super Psycho Love by Simon Curtis

Daisy: Umbrella, All Time Low version

Mami: Face Down by The Red Jumpsuit Apparatus

Kazuichi: Leave Out All The Rest by Linkin Park

Hibiki: Open Door by Mike Shinoda

Leafpool: Safe and Sound by Taylor Swift

Mukuro: Guillotine by Jon Bellion

Lloyd: Heat Waves by Glass Animals

Susie: Take Me Out by Franz Ferdinand

Link: Castle of Glass by Linkin Park

Isabelle: Hang onto Yourself by Palaye Royale

Papyrus: Don't Stop Me Now by Queen

This may or may not change depending on which path I decided to set for certain characters

Let me know if you can find a better song fit for a certain character

Cya in the next one -Flare