Don't be alarmed if you start seeing Street Fighter's Ryu running around in Monster Hunter: World. Capcom added a crossover quest today that lets you play as the big-footed "Martial Artist in White."
Heads up, Hunters: Ryu from @StreetFighter joins #MHWorld on Feb 15 at 4pm PST / Feb 16 at 12am GMT for hunters with #SFVAE save data on PS4. 🥊🐲 pic.twitter.com/aoZ0V7Ljr8
— Monster Hunter (@monsterhunter) February 15, 2018
You can find the quest by heading up to the Gathering Hub. Once there, just stroll over to the Arena Counter and post a quest called "Down the Dark, Muddy Path" found under the Challenges heading. It's a battle against a gargantuan Barroth, and you'll need to be Hunter Rank 3 or higher.
Currently, you can only initiate the quest if you have Street Fighter V data on your system. According to Capcom, the Street Fighter gear will be out for everyone "at a later date."
As for the Ryu armor itself, the Smithy will forge it for you in the Workshop (it's listed under "Full Armor Sets"). Here's what it takes to craft: SFV Ticket x7, Monster Bone M x6, Earth Crystal x6, and Barroth Shell x5. With that in mind, it'll take some time. My hammer smashin' skills need work.
via destructoid https://www.destructoid.com/how-to-play-as-street-fighter-s-ryu-in-monster-hunter-world-488891.phtml