Whoops, my bad. I don't think I've ever even heard of Yukio, outside of a character I do not remember from a Wolverine movie and then I didn't make the connection to the Deadpool version.
I was thinking Mariko.
I only think of Yukio as "Storm's human friend" that's basically a Japanese punk/biker chick from when Gambit and Storm fought the Phalanx for the first time and Gambit got the entity to absorb his motorcycle (and its gas tank) before he detonated it with a playing card.
I know she's associated with Wolverine, I've just never seen her have any dealings with him aside from the second Wolverine film.
As for X-Treme X-Men, they were my preferred book during the whole Morrison "re-imagining." I know people claim they're cringe-inducing, but alternately the Morrison costumes consisted of turtlenecks, just as much black leather and Emma's zip-up diaper. So I preferred the more colorful options X-Treme had for costumes. I'd take a Gambit, Psylocke and Storm from that era. Never really was a fan of Rogue's red/black wetsuit with glasses. Tessa / Sage always seemed more like a guest-star in that book more than a full member of the team itself. While I like Beast and Bishop in those books, I don't need those looks and more than I need tentacle Callisto that followed shortly after. Don't need Vargas the Spanish swordsman (I assume Larocca's input). They can make Thunderbird III, Slipstream and Lifeguard but they'd be the ones I wait a year or two for on steep discount. While I like Xorn conceptually, I don't even think I'd really need him either, since he was from around the same time frame that X-Treme was running.
So basically 4 looks from X-Treme I'd actually buy to go with the X-Treme Logan we already have. Of the "Revolution" Era that came just before with designs by Leinel Francis Yu, I'd probably only opt for the armored Archangel look just for novelty, as I need even fewer looks from that era (I'm looking at you bug-eyed goggle and backpack Beast and "Pirate Psylocke").
I'd prefer the original (non-Bendis) O5 looks, and maybe just an X-Treme character peppered in here and there like they did with Logan.