I can turn my skin to steel.
From Create Your Own Story
"I can turn my skin to steel", you demonstrate.
"Well then, I think I'll call you Colossus jr.", Elixir says.
"Please don't", you reply.
"Okay, then what about Metal Lad? Or Steel Man? Or what if you learn magic and become the Steel Sorcerer?", Elixir suggests.
You:
Ask if a codename is really necessary
