My current obsessions include:
Battle B-Daman: Wen is my favorite character, and I love fics centered around him and Li. I don't support any pairings but have a soft spot for Bull/Karat.
Digimon: I love TK and enjoy brotherly fics between him and Matt. I support TK/Kari and Tai/Sora.
FullMetal Alchemist: My favorite character is Alphonse Elric, and I like stories centered around him and Ed. I support Roy/Riza.
Naruto: I love Kankuro (especially after the time skip), and I enjoy brotherly stories between him and Gaara. I don't really support any pairings though.
X-Men: I am a huge Rogue fan and enjoy most stories centered around her, especially when she's paired with Gambit.
Yu-Gi-Oh: Mokuba is my favorite here, and I love brotherly fics between him and Seto. I am fond of Joey/Mai, Tristan/Serenity, and Yugi/Tea.