Best video game based on an anime? Dragon Ball Z: Budokai Tenkaichi 3 or Jump Ultimate Stars. I did also like Naruto: Clash of Ninja 2.
All of the three are fighting games, but I guess those are where anime tends to shine in game form.
Oh, as for the second topic, nothing. I have yet to be satisfied seeing video games turned into anime since video games have so far always done stories meant for them better. Nothing comes to mind that might benefit from being parsed down into a 12 episode anime story.








