<Snipped quote by ImportantNobody>
Looks like I'll have the time, and certainly sounds like a fun concept, so if you'll take me I could give you a fight! Would need to know a little more about your character though... I get that she's basically impossible to even wound, but does this simply mean impregnable skin, or the ability to cancel out the momentum of objects coming onto contact with her, or what? Also, would she have any powers or skills other than this amazing defense? If you can give me a few details in this regard, then I should be able to pick an appropriate opponent for her and have us a brawl!
Option #1:
It's not just her skin, but her entire outside being and clothing. I imagine it as some sort of invisible, heavenly aura coating her that could be described as a physics deflector, breaking down outside physics as we know it, negating all previous momentum in the process as well as the concept of hot/cold, etc. So if someone punches her and their punch stops, they can provide additional force to pull their arm back, but pushing forward into the field again would still result in a cancellation of their forward physics as it collides with the barrier. If their muscles providing the pull back were directly against the field then they couldn't pull back because those muscles wouldn't work right. The aura is only super close to her skin so she cannot stop the physics of their heart by touching them, only the skin and superficial muscles directly in contact, which would feel numb and paralyzed.
Objects can still go through openings such as her throat so she doesn't starve and suffocate, although this is a huge weakness that makes her far from invincible. Perhaps the aura fills in the gaps subconsciously between breaths and such, so allows things she wills for entry. This sounds a tad like a cop out, tough.
Option #2:
She's a created being from angel cells (or some equivalent that's less stereotypical), having barbie doll anatomy and never ages. This makes clothing damage (which isn't protected in this idea) not really a problem as she has nothing in need of censoring. Maybe her skin is unnaturally white as well. Her entire being would naturally be near invincible so she'd not have a clear weakness to poisons or suffocation, able to hold her breath indefinitely(?). This idea more embraces her level of OPness I had imagined for her rather than some idiot throwing a standard gas grenade to win.
Her other physical abilities I'm debating on, but at least peak human. At most they'd be around a tier or two lower than her durability stat. That being said, she could still leap around cities, outrace cars, and punch through steel, but relies mostly on durability to win. The standard form, perhaps, could fight ten skilled but not superhuman martial artists without relying on durability to win.