I was messing around with the "randomize character" option, and noticed a few things.

First of all, the tainted soul/forgotten are separated. That's absolutely fine. They are technically separate characters. HOWEVER, if rerolled randomly into the tainted forgotten, you're simply stuck on the floor. No moving or anything.

I'm not suggesting that you remove that from the character options. It is a character after all. What would be nice, however, is a way to pick and choose characters that you could reroll into/exclude without using a bit of a roundabout way. I did find a solution, but it's a bit iffy.

The only reason I bring this up is because I was trying to make a challenge for my friend where your character rerolls every new room.

This should absolutely be at the bottom of your priorities, and it is definitely possible you're aware of this. But it would be a nice quality of life change.