Except SMT Alice has no stated connection to the Alice of Lewis Carroll. There is nothing in her description as a Persona nor in her original appearances in games like SMT I & II that in any way refer to her as the storybook character. The only direct reference that I'm aware of didn't even come until Strange Journey, when she's involved in a sidequest about locating the Hare of Inaba, which she immediately begins torturing when you help her find it. Otherwise, she's just a young girl with an appearance and name that match the Lewis Carroll character, but she is not the Lewis Carroll character.
These are video games. Appearance and name literally define something like half of the "characters" in this database.
On the complete flipside, (Wind Waker spoilers) Tetra gets lumped in on Zelda's page when 1) She isn't actually Zelda, just a re-incarnation or descendant or something, and 2) she's got her own look, personality, and name. There are more than a few entries on here where if you drill down deep enough into a game's fiction, ultimately one character is technically also another character so they're merged as an entry, and honestly, that's kind of messed up too. Like the thing with Tetra, the search hit itself is a massive spoiler that presents itself in the search field. (Classic example, try looking for a certain character from Deadly Premonition. Or don't, if you haven't beaten the game or watched the endurance runs yet.)
My point is that sharing an appearance and a name with another character isn't really a good justification for merging or maintaining separate pages. Back on topic, I haven't played any of these, but hypothetically Satan from the upcoming South Park game will almost certainly be different from the Satan portrayed in Dante's Inferno. I'm all for a Satan concept and individual entries where the character isn't completely trivial in the context of the game. I just doubt an overhaul like that will get approved (and that's a shame).