As people would probably have been able to guess from last year or the year before, my current favourite game of all time is
Jump Ultimate Stars. It offers such a diverse range of characters to satisfy most Shonen Jump weeaboos, along with a sizable amount to unlock and a myriad of customization options available when you make a "Deck". Smash Brothers with supports and KOs and manga characters all come together in a little DS cartridge full of joy. Even if you're not an anime/manga nerd, all the colourful characters, panels and features are all enticing enough to even just experience for the "wtf" factor. Nothing quite beats flinging pink poo at your opponents while they have a bulldozer dropped on top of their heads.
It's hard to find a true favourite character that I can cite immediately from the top of my head, but the closest to this is
Ninon Beart from King of Fighters 2006 (err...Maximum Impact 2). This little goth girl shoots small and gigantic lightning balls, immolates you with fire, summons wind and water, and can make meteors rain on your pathetic corpse, all while awkwardly smacking you in a gothic lolita outfit with some self-styled fighting art. Quite a lethal little girl to say the least.
Jam it back in, in the dark.
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Summonmaster