Bruh, I was working on a hax CRT that I was planning to upgrade the [PROTOTYPE]-verse top-tiers (which, if all the changes gets accepted, would make this thread become even more of a stomp in Alex Mercer’s favour than it already is), and I was planning to finish it soon…
Before I’ll continue working, I’ll say this:
Canon Kars gets hax-stomped by Alex Mercer in a speed-equalised matchup - Kars is not overcoming the level of regeneration Mercer has, while P2 Mercer will stomp him by either infecting Kars’ every body at the molecular level (something which Kars will be helpless against; and with Kars lacking the plot armour that James Heller has, he’ll get driven into complete insanity and become a mindless Infected the moment he gets inflicted by the Blacklight Virus) or absorbing Kar's entire body via touch…
The Pillar Men’s cellular-dissolving acids gets counteracted by Mercer’s regeneration - though even without Mercer’s regeneration, the Blacklight Virus would just passively infect the cellular level acids the moment it even attempts to enter Mercer’s body (nevermind Mercer simply absorbing it the moment it even touches him), so the acids wouldn’t even work in the first place, so no possible absorption for Kars with the acids rendered useless (or in an even worse case, if Kars gets his entire body infected for even attempting to absorb Mercer).
In addition, Kars will be unable to copy Mercer’s abilities.
As for why Kars will be unable to copy Mercer's abilities?
It's simple…
…Mercer isn’t even from Kars’ universe, the Blacklight Virus or any other superhumanly powerful viruses doesn’t exist in the version of the Jojo universe before Pucci reset it, and there isn’t anything mentioning that canon Kars is able to copy viruses. Even without taking Mercer being in a different version of Earth into consideration, Mercer is not human, he's literally a virus - not only that, but his entire body is made of nothing but viruses… And if we consider the Blacklight Virus as a retrovirus, then it has RNA instead of DNA (as retro-viruses only has RNA, which is technically different from DNA)… So, by virtue of the fact that Mercer lacks DNA (combined with Kars lacking feats of copying microorganism abilities such as bacteria, nevermind scientifically non-living ones such as viruses), Kars will be unable to copy him, regardless of how much Kars would re-arrange his DNA.
If anything, Mercer will be the one to copy Kars' abilities - Mercer only needs to absorb a piece of Kars' body, and he would gain all the genetic abilities Kars has via mimicking Kars' genetic information and duplicating Kars' entire genetic structure. Mercer could get everything Kars has on-top of Mercer’s own Blacklight abilities if Kars isn’t careful, while Kars will be left with just his measly Ultimate Life-form abilities.
Or in short: canon Kars gets outhaxed and gets stomped. And stomp matches will not get added to either of the characters' profiles.
Anyways, please wait until I've published the CRT and not make any matchups involving any of the [PROTOTYPE] characters in the meantime. :L