Arakune's Theme, Thin RED Line. It really captures just how insane and twisted he is, combining metal with disjointed piano pieces, violins that switch between shreiking and weeping, synthesisers and, oddly enough, flutes.
"Thin RED Line II". Now with organs and guitar riffs that sound like something by Motoi Sakuraba.
Bang's Theme, REPPUU (Gale), is the perfect theme song for manly hero of love and justice.
And the vocal version, REPPUU ~Second Wind~, based off a vid from Nico Nico Douga. WARNING: This song is so manly, it's been known to make women pregnant. Exercise extreme caution!
Just when you got it couldn't get any manlier, the Live version was released. Bang's seiyu nearly lost his voice singing it, but pressed onward for great justice and finished it. MANLY.
Endless Despair, Unlimited Hazama's theme. A theme that conveys, quite perfectly, the message that you are now fighting the very evil main villain, he is using his true power, and he is going to kick your ass.
The console version gives us a new character: μ-12. She's the True Final Boss of Story Mode, so she has to have an epic theme, right? And she does: Sword of Doom. A theme with lyrics describing a sword of sin, stained with blood and death, falling into the azure.
And if you thought the song couldn't be made even more awesome, here comes "Sword of Doom II", which ditches the ominous chanting of the original and instead sounds more heroic. "Sword of Salvation" jokes abound.
Alexandrite, Makoto's theme, is very fitting: spunky, upbeat, and leaves a very big impact indeed.
Here's Butterfly Sky, the vocal version of Alexandrite. Becomes a heartwarmer if you know what the lyrics mean. Check out Makoto's entry under BlazBlue for more info.
Plastic Night, Relius' theme. It gives a boss-like feel while sounding evil and gentlemanly at the same time. Not only that, it has one of the most sweet sounding riffs in the series. They're seriously beautiful.
"Plastic Night II", which now features a pretty ominous intro and a badass piano.
"BUSHIN (God of Dancing)", Amane's theme. The use of Japanese instruments definitely gives it a classic feel. But don't let the soothing intro fool you, when the guitar riffs start to kick in, you'll realise that Amane means business.
"The Tyrant", Azrael's theme. As if his name wasn't enough already, the song title and the rather chaotic sound of the song itself really bring the fact home that he's not someone to mess with. It also sounds like something out ofPokémon.
Accursed Heritage. A theme for Relius Clover vs. Carl Clover matchups. Dark, tense and tragic, yet you can just feel the hate. And, it combines Relius' dark, twisted music motif with Carl's characteristic jazz.