My absolute favorite? That's hard. I guess it would be LOZ: Ocarina of Time. It may not be perfect but I tend to replay it often. My second would be Ratchet and Clank: Going Commando. I must have about 20 playthroughs.
But all of my favorites?
All Zelda games except the CD-I's and LOZ II
All Mario platforming games except Mario Sunshine
Xenosaga series
Xenogears
Digimon World 3
FF V,VI,Tactics, Tactics Adv.
R&C series
Jak series
Banjo & Kazooie/Tooie
SSB series
SMT games
Disgaea series
DMC series
Spryo series
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Me: The voices in my head love me, the really love me.
Voices: Uh, yeah. No.