Ok I got a good one here: Deadpool vs Alex Mercer! Both have extreme regenerative abilities, both are immortal. And before u say it, Mercer is immortal, the health bar was a gameplay mechanic for prototype. The truth is Mercer can only be killed by one of two means: consumption by another Blacklight being, like what Heller did at the end of Prototype 2, or complete annihilation, as in drop a nuke on him. Honestly this isn't even a real death battle cause neither one has the means to kill the other. I'd give the fight to Mercer to be honest. I got another one planned too: Tony Stark vs Samus Aran! Look for it soon!!
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I dont see health bars in the prototype and deadpool game/s as an actual healthbar, i see it more as a "im ganna retreat to catch my breath and think things through" bar since as u stated, they cant die. <.< thats just my way of putting it tho.