Marvel Comics character Flatman has the mutant ability to stretch any part of his body to great lengths and possesses a flat, nearly two-dimensional body. He uses his flatness to help dodge attacks, slip through very thin spaces like under doors and appear invisible by turning to just the right angle. He uses his elasticity to help "launch" attacks by using a slingshot effect.
Big Bertha from Marvel Comics has the power to alter her mass by increasing or decreasing the fat content of her body at will. In her Big Bertha form she has super-strength, stamina and invulnerability. Bertha can purge the excess of her body fat through regurgitation of the collected fat masses in order to retain her original figure.
Marvel Comics character Mr. Immortal possesses true immortality, which means that he cannot be permanently killed by any means. It's unclear how he comes back to life, but after being killed he resurrects almost instantly. This ability seems to be subconscious, since he has tried to commit suicide on numerous occasions only to walk away unscathed afterwards. Mr. Immortal is a mutant. However, it has been explained to him that he is not a Homo superior, but has evolved beyond death. He is a Homo supreme, and will live to the end of the universe, and be the one to which its final secret will be revealed.