Epsilon mutants are severely flawed; their inhuman forms make it impossible for them to function properly. Delta level mutants have human appearances&controllable mutagenic abilities. Gamma mutants are strong but come with a cost that makes their lives very difficult. For example, Rogue can’t touch people without triggering her power while Beast has a physical deformity. Beta mutants are believed to be about 10% of the population; they’re classified as those who have great strengths but have lesser control of them. For example, Cyclops cannot negate his optic beam willingly&Wolverine heals even when he doesn’t want to. Alpha mutants are extremely rare&they have precise control over their powers; Psylocke was an Alpha, as are Gambit&Colossus. Those in the Omega category are on top of the food chain; they have control over matter&energy, and two members of this group are Iceman&Phoenix.
Psylocke, by Billy King.