Reincarnated with the Madness combat Halo as a cat in Sonic the hedgehog.. Let's say during the whole werehog thing.
just Sonic world in general.
Let's turn MLP into a vampire fic with our poor poor vampire MC finding out that this Anthro world is a lot more violent and.... anime?
Let's give Mario some love with a fanfic set in the Mario and Luigi version..
Let's have some fun and... Throw Konosuba a Bone.. A Konosuba fanfic that hops between the Gwain Saga and Konosuba world due to the MC, (Preferably the previous system Vampire one) Dragging Kazuma into a chat group and more characters such as Chara, Gaster, Maka, Soul, Harry Potter, Hermione, Sonic, Blaze, And lastly Twilight Sparkle and let's say... Fluttershy (just to torment the thing, and maybe seriously warp the anthro ponies into killing machines and having their world freak the fuck out about the becoming warriors that'd be fun.)
Aw shit I just got a new idea, Full metal alchemist is all about that cool shit and nobody even glances at it or it's powers and that's unacceptable.