I have an interesting idea about a champion design: Dr. Jekyll and Mr. Hyde style

I wouldn't expect them to have these names and it wouldn't be a transform champion since we have loads of those. I'm saying that this is two different champions. Champ 1 has some lore and so does champ 2. But somewhere in champ 1's lore they had some sort of psychotic break and came out of it as champ 2.

I thought it would be cool if champ 1 was an already existing champion. This type of thing was theorized with LB and J4 as well as with Jhin but I want this to be in the lore. Also, the "league" isn't canon anymore (as in there is no big tournament) so this wouldn't violate that. The best part of this is when champ 1 and 2 are in the same game so they have some sort of special interactions depending if they aren't on the same team or not.

What champ that currently exists could be champ 1 (as in pre psychotic break)? I think J4 or Garen are good options since they represent kinda regular people. Jayce maybe.