Note: I don't own anything
Idea №10 Bleach x Worm
A soul tries to escape from the Hell dimension in Bleach universe to the world of the living, but something goes wrong and it ends up in Worm universe. Somehow, even though this soul only has a spiritual body, it gets a shard due to its "experiences" in Hell and becomes a parahuman. This soul is still connected to Hell through its chains and it knows that if it dies here without dealing with the chains then it will end up right back in Hell. The connection to Hell is weak enough that the soul can reveal its face/not wear a mask without Hell dragging the soul back as a consequence (it's still a soul tho, so under normal circumstances nobody can see it or its face anyway). The soul still keeps whatever powers it had back in Hell because it is a part of its being (it should have at least some power or powers, otherwise it wouldn't have been able to escape in the first place).
Anyway, because its a soul it automatically gets a pretty high Stranger rating (almost on par with Imp's) if we use the PRT power classification system (nobody can see it under normal circumstances cause nobody in this world has spiritual energy and etc., the only things that most will be able to see are the results of the souls actions). At least a pretty decent Mover rating (it did escape Hell somehow, so it had to be pretty fast even by Bleach standards, also, souls can stand on air). A decent Brute rating too. It somehow escaped Hell so it probably has above average amount of spiritual energy, which directly translates into increased durability and strength, also, souls seem to regenerate faster than physical bodies, and because of its connection to Hell and because it may have been a Hollow before getting sent to Hell it probably has even faster regeneration as well. Hollows are pretty infamous for their regeneration ability and extra toughness, and in Hell souls are forced to regenerate A LOT (and because of it the soul may have higher pain tolerance too).
As you can see it's a very bare-bones idea. How does the soul look like, what is its personality, backstory, unique powers, goals (other than dealing with the Hell chains) and etc.? All of it and more is for YOU to decide (if you want to ofc).