30 Day Challenge: Day 15 Two-Player Characters

The recent goblin punch post, The Mother of Osk, had me thinking of concepts for characters played by two players, or two characters in one body, that sort of thing. Some of these I've done or talked about before, but whatever, here are some rough concepts for two-player characters:

• Intelligent mimic armor
  
• Two-headed ogre
  
• False Warlock patron (a psychic, extradimensional, or physically parasitic entity granting powers to a "warlock"- not actually a god or demon or anything like that)
  
• Matryoshka mutant: Identity-within-identity-within-identity, each with some unique ability
  
• Alt to above- Mutant Menagerie: A psychic prison or zoo contained in the character's mind from which special abilities can be co-opted. One psychic entity has escaped...
  
• All at once: A character across multiple moments in time existing simultaneously.
  
• Living system: A living idea, a living institution. It's constituent parts may or may not have identities of their own, but collectively they serve a greater consciousness they may or may not understand or even be aware of.

Some of these are a bit high-concept and might need some work to bring to the table, others I think are pretty much good to go as is. Anyway, this is a really cool concept that I'd like to flesh out more in the future.