All of the Capricorn Pirates in One Piece: Parallel Works have their own leitmotifs (according to Word of God) that reflect their personalities and interests.
Nearly all characters have one in Turnabout Storm, as per Ace Attorney standards. It gets taken a step further from the games by also giving each witness different Cross Examination and Objection! themes that represent them during the trial sections.
The Harry Potter Septet is a seven-movement septet composed by Vi Hart and posted on her blog - although the Septet is now accessible only by visiting cached pages of her blog through the Internet Archive Wayback Machine. Numerous characters, events, and locations of significance in the books are represented by themes, many of which, of course, are worked into subsequent movements.
PMD-Explorers have been giving out Leitmotifs since mission 7. It now has it's own page for theme songs.
Thunderous, deafening technomusic seems to be the defining leitmotif in Red Lightning, especially for the Underground. This ties in nicely with their "Unnatural" theme.
In Number Zero Iggys Castle, the Shopkeeper has his own motif that starts out 8-bit and adds more modern instruments the further you progress in the game.
composed by Vi Hart and posted on her blog - although the Septet is now accessible only by visiting cached pages of her blog through the Internet Archive Wayback Machine. Numerous characters, events, and locations of significance in the books are represented by themes, many of which, of course, are worked into subsequent movements.