No I'm thinking WC / Ted Grant.
the ability was first brought up in a JLA/JSA story that introduced Jakeem Thunder. He was killed and then came back to life. Hr was asked since when iy was possible and he replied since the beginning. Foota keep your advantages close to the chest.
it was then the diff story detailing how it occurred basically in his early Adventures he had been magically turned into a cat Zatanna turned him back and the result of that was that he gained 9 lives. There was then another story in JSA classified with he and Jay Garrick were in a battle, during which the remainder of his lives were almost used up leaving him only one again. Each death has himnrevive at the physical age he last died at. Part of the reason for his yourhful vitality. Finally he was killed again and came back to life. Mr Terrific and Dr midnight concluded that he can only be killed completely of he is killed 9 times in thw same 24 hrs.
As already mentioned wild child evolves into different forms
1. Classic wild child - feral fighter. Lower version of wolverine and sabretooth but st times can put up a fight against them. Other times he is overmatched
2. Weapon omega - no longer feral. Human like and was trained by the best in the world to be a skilled h2h. Nick fury even trained him
3. Wildheart - still human like but feral tendicities are slowly coming up. Pretty tough. Had an even fight with wolverine
4. X-Factor - ignored everything prior. Reverted him into an immature teenager. At the end of the series he evolved into a super feral mode...which was ignored in his next appearances. Sabretooth bullied him around in his teenage feral form. The upgrades feral form only had one appearance
5. Weapon x - looks like a bald headed vampire. Terrible rendition. This form doesn't have a healing factor and did nothing of note worthy under then beat sunfire by shooting him
6. Romulus upgrade - most powerful form. Faster then wolverine and claws that that have poison on them that can even put wolverine to sleep for 2 days. He beat wolverine, sabretooth and Sasquatch without much issue