I wish there was a challenge character who's gimmick isn't just that they can't have health.

Basically all of the more difficult characters in the game are kind of the same, they are all difficult because they can't have much health (the Losts, Keepers, Tainted Jacob). I wish there was a more difficult character that actually could pick up health, but maybe instead they would be difficult because of some gimmick that would make it much harder to scale into the lategame, bonus points for weak starting stats as well.

I think OG Tainted Lazarus fits this description, but he's got buffed like crazy. Now the closest we have to this is Eden, who can have some seriously bad starts, but even Eden doesn't have any trouble in the lategame usually, and most of the time he has decent starts anyway. I don't think J&E or the current version of Tainted Lazarus fits with what I want, they have such powerful strengths to counteract their drawbacks that I wouldn't really call them challenge characters, and I personally would like a character more difficult than them.