>>> mmm...
Tidus: fast but has too many unnecessary moves..
Cloud: strong but lacks the brains..
Squall: too full of himself..
a tie?
Cloud
Squall
Tidus
If Squall gets a shot off then he'd kill someone. Other than that his tight hipster leather pants and assortment of belts are far too inconvenient to be flexible and nimble in combat.
By that same token Tidus has the most flexible clothing but also has a lot of bare flesh so would be very susceptible to getting hit.
Cloud is the most appropriately attired but has a gigantic sword which probably takes an age to swing leaving someone more flexible like Tidus to get a hit in.
In short, none of them. Irvine would shoot them all and then whip his hair back and look fabulous whilst strutting off into the sunset.
I dont think we can look at this from a damage perspective as they'll all be 1-shotting eachother anyway and thats stupid.
I second aulaynas final decision.
Eyyyyyyyyyyyyy
If you mean a real shot - Squall's Gun-Blade cannot shoot. I know there is a picture with clips and the critical hit itself sounds like a shot but when comparing Squall and Yazoo's weapon Square stated Squall's cannot shoot. If you mean one-shotting like TrollHunter just like "one hit" in general for an OHKO it is still about counting just the story or the stats.
Cloud's swords are stated to be light-weighted (by himself in Dissidia). At least for him. He does not seem to be that slow, at least he could block some moves of Sephiroth who was toying with him.
Ok, then. Let's take a different perspective.
Cloud - Genetically modified superhuman
Squall - Normal human
Tidus - Undead normal human
Yeah, it still looks like Cloud to me. Rinoa as a sorceress and Yuna as a summoner would be better representatives from their games for this sort of assessment (where Rinoa would probably win).
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I don't think you can that any of him are normal humans when all of them have killed godlike creatures and survived attacks that would kill any of us easily. Cloud can cut buildings in half, Squall took a giant icicle through the chest and lived, Tidus can hold his breath underwater for like forever and hurl and kick a ball at great speeds while underwater.
In this fight Tidus would be the 1st to lose. He lacks the ability to summon and if the other two start off summoning then he loses right then and there. I think Squall might win this though. It's hard to say who is more powerful going off from story since Cloud has been expanded more than Squall and Squall theoretically could be just as powerful or possibly stronger. Also why no Zidane?
Good agility and Time Mage spells are natural to Tidus. He has a significant speed advantage over the others. Now this would actually help except for the Gunblades' unique ability to never miss their intended target.