Best Theme Music for Each Character

[Blue]

Seconding Hikari no Willpower for Trunks. I'm torn between Final Bout's Freeza theme and Kai's insert song when he stabs Kuririn.

[Super Saiyajin Luffy]

Vegeta: Saiyan Blood
Just cool, fits Vegeta perfectly ^.^

My favourite Minions, THE GINYU FORCE: Sanjô!! Ginyu Tokusentai!!!
Catchy, TOKUSENTAI!!!

Future Trunks: Hikari no Willpower
Fits his story and his world, being the lonely warrior, the song fits the melancholy!! Just hear it too much!!

[Codarik]

I always thought "Heroic Trunks" was a great theme for Trunks. One of my favorites.

[Ringworm128]

Only a Chiling Elegy.
Take the Stage!! Ginyu Special Squad!!
Saiyan Blood.
Dub Pefect Cell theme.
Dub Super Buu theme.

I know its not a Character theme its a stage theme but Meta Coolas theme SSW2.

[Piccolo Daimao]

Bardock's theme Solid State Scouter just sounds awesome, and defines Bardock's character the best for me. Those mechanical noises reflect the technology that the Saiyans' world are based around too.

And, of course, Trunks' theme from Ultimate Battle 22: Hikari no Will Power. Encapsulates the cool, lone warrior character of Trunks.

I don't think this might be necessarily the best (Hell's Bells beats it), but my favourite Vegeta theme is SSj Vegeta's theme, or Vegeta Attacks Cell, which has always given me chills, especially that beginning. To me, it's a really memorable track.

Freeza's Final Bout theme is probably his best theme music. It's an atmospheric and suspenseful theme that fits the cold and callous nature of Freeza.

And I don't know whether this is the best theme for Super Saiyan 4 Goku, but I have to mention this. Hero of Heroes from Final Bout. Probably the best theme music of the game.