Straight from a nightmare I had.
Thomas Infolded is, by most definitions, a cannibal. He eats people. Technically, he infolds them. He weighs twenty two and a half tons, but he can fly.
And he looks just like anyone else.
Thomas has the same outline, but the paper inside the outline is crinkled and warped and extends backwards and forwards. There's more surface area. There's more Thomas. A lot more Thomas.
He eats people by touching them and folding them into his body. For a few seconds, they look like they're falling into his flesh, as if he's much farther away (and much larger), or they're shrinking. And then there's a ripple and warp and he's whole again.
He eats people to gain their memories and their powers. He's a polymath. He speaks most languages. He's a very powerful wizard (but keeps it hidden in his infoldings, so you'd be hard pressed to detect it from a distance).
Stab him, and fresh hearts swim to the surface. Thomas's outline is human, but the filling isn't. Not really. Not anymore.
Thomas has a lot of HP. Physical damage is irritating but rarely dangerous. He's eaten people who can regenerate; he heals very quickly. He's hard to assassinate; his infoldings have eyes in all directions. He's hard to poison and hard to trick. He can fake his own death (he's done it more than once).
It might be possible to kill him by letting him eat someone unpalatable or fundamentally unstable.
He's strong, but not overwhelmingly strong. There's only so much muscle you can cram into a human-shaped outline. He's smart, but his brains still take time to process information.
But he's been alive for a long time. He's eaten several immortals. He's not done eating yet.