Hunter theme from DmC: Devil May Cry by Noisia = This track encouraged me to play what i thought would be an aberration of Devil May Cry. The beats man, the beats..
Ultra Violet. Nelo Angelo's Theme from the original Devil May Cry (DMC1) = This whole track just screamed epic at my face with the face of a thousand demons.
The Finalizer, Jinpachi Mishima's Boss theme from Tekken 5 = There's something about this beat that makes me like it. As a battle theme, it has that slow start then it suddenly spits at the listener's face while the very boss he/she's fighting against is using every dirty trick in the book.
The Tyrant, Azreal's theme from Blazblue Chronophantasma (with Vocals by his very own seiyuu) = While its not exactly a "boss" character's theme, it does become if you played someone's story mode where Azreal is one of the bosses (or the boss). What makes this feel so great is the whole thing is straight up power, much like the character it represents. The cool and funny thing about this song is that a lot of people would even joke about how this song makes it so fitting as a boss' (or champion's) theme in Pokemon.
Wu Zhang Plains theme from Dynasty Warriors 7, Shu's final battle = The Dynasty Warriors series of games is known (at least for its fans) for the portrayal of the battoe of Wu Zhang Plains. Basically, it would be the kingdom of Shu's final battle against its rival, Wei (More specifically, Zhuge Liang's destined final battle against Wei). DW7's rendition of the theme is unique for its very relaxing tune compared to the past series' versions but there's something about the relaxing guitar strums that make the tune so great. Its basically a calming storm before the epic final battle, and that's the reason why I love the theme. Its relaxing, yet its the sound of a battle that would determine a kingdom's fate. It has that lonely and calming tune that makes me feel that I'm engaging in a battle that would be the "last". A dying leader's wish, a kingdom's destiny, and a 5 out of 5 star difficulty stage that's worth playing.
Last and certainly not the least, Barkley Shut Up and Jam Gaiden's Final Boss theme (at 3:45). Of all the fan made games that I've played, Barkley Shut up and Jam Gaiden is one of the best and most entertaining pieces of code and epic that I've ever played in my life. It comes complete with a very epic yet simple final boss theme that is a culmination of the silly, humorous, yet epic adventure that Charles Barkley and his allies face.