>>80933728My crack theory is that Rose actually made Lion for Steven.
Lion aides Steven as a invaluable weapon, transportation, and mentor.
He takes Steven to Rose's armory, saves his life a bunch of times, show's Steven that he's storing a bunch of important Rose shit, etc.
So if we're assuming that Rose made Lion to help Steven, we know why he exists but now how.
We've seen Gems manipulate organic material before. Evil breakfast, Frybo, Rose and her plants.
However, Rose (and Steven) are unique in their ability to actually create autonomous sentience rather than just possess something.
So my guess is that Rose used this ability to store a massive amount of her diamond-level Gem power inside a regular ass lion - granting it intelligence, a huge life span, and Gem abilities.
This is why Steven has such a hard time with his Gem - he's working with a fraction of it's power. And he's already almost killed himself several times with it.
Lion will likely serve as some limit break shit, return some power to Steven when he desperately needs it.