Ryu

Ryu is the main protagonist of the Street Fighter series

SMG4: War Of The Fat Italians 2019
A false version of him fights Mario and SMG4's creations. He is eventually beaten by Kermit The Frog.

SMG4 Christmas 2019: Mario Alone
Another false version is created by Axol to beat up Waluigi.

SMG4: Mario Gets His PINGAS Stuck In The Door
He appears in Mario's imagine, kicking him.