BLEACH

BLEACH crossovers
Chronicles of Chrestomanci, Discworld, Johnny Maxwell, Gargoyles, Good Omens, Highlander, Ouran High School Host Club, Philip Reeve's 'Hungry City Chronicles', Temeraire, The Jungle Books, The Matrix

Chronicles of Chrestomanci

Discworld

Discworld crossovers
DC Comics, Kim, Lord of the Rings, Ouran High School Host Club, P. G. Wodehouse, Princess Tutu, Smallville

From Eroica With Love

Gargoyles crossover
Eyeshield 21

Good Omens

Good Omens crossovers & AUs
DC Comics, Discworld, From Eroica With Love, Master & Commander, Neverwhere, Saiyuki, Smallville

Hanakimi

Hitchhiker's Guide to the Galaxy

Lord of the Rings

Master and Commander

Ouran High School Host Club
May include traces of Eyeshield 21 and space pirate AU

P. G. Wodehouse

P. G. Wodehouse crossovers & AUs
DC Comics, Discworld, Stalky & Co.