Books:
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*Alice in Wonderland. (Everyone looks & acts insane, triped-out envirnments, old-school cartoon violence).
*Marvelous Land of Oz. (Almost everyone is a Munchkin. Witches keep sending animals & sentient plants to kill the inhabitants).
*Candyland from The Nutcracker & the Mouse King). (All the houses are made of candy, all the players are toys, & big monsters keep trying to eat the towns & break the people).
*Harry Potter. (Not hard to figure this one out).
*A Series of Unfortunate Events. (Everyone gets to be a VFD agent, good or bad, lots of PvP & setting fire to buildings).
Anime:
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*Slayers.
*Dragon Half.
(Both are heavily inspired by Dungeons & Dragons).
*.hack//
*Bastof Lemon.
*Hunter x Hunter (especially Greed Island)
(Those three are already set in an MMOs as it is).
*Record of Lodoss War or the chibi counterpart Lodoss Island.
*Bakuretsu Hunter.
Games I don't actually mind seeing other players in:
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*Neverwinter Nights.
*Dungeon Siege.
*Baldur's Gate.
*Icewind Dale
*Diablo.
*Morrowind.
*Bioshock.
*Aveyond.