If I recall correctly, Invincible Saint ~Salaryman, the Path I Walk to Survive in This Other World~ He's a healer, yet he more or less turns into a warrior who can use healing magic.
Just heals quick? Zhan Long has dozens of healers that heals the main character... He is basically healing I guess...
if you're fine with an original novel then "The Zombie Knight" the mc can't die unless his reaper is killed and the mc doesn't has an OP power compared to other of the same being
Mc Evolution Theory of the Hunter absolute regeneration although his head or heart is blow up by bullet as long as 1x/day
I second this. Also in Chaotic Sword God, cultivators with the light element can heal wounds and have the nickname 'immortals' because they're hard to kill on the battle field, with higher level ones regenerating limbs and even raising the dead. The mc can use it too but where I'm at he's not that high level with it and only uses it outside of battle while keeping it a secret.
https://ohanashimi.wordpress.com/saints-recovery-magic/ this dude is basically unkillable because of his heals.