Liked Mewthree vs SSJ5 Goku and 64 Luigi vs Satsuki Rin? Well then, I have made another MU with a vibe similar to those MUs
Sheng Long vs Ashura the hedgehog (Street Fighter vs Sonic the hedgehog)
Fan-favorite urban legends from 90's video games that originated from errors in the second installments of their game series ("You must defeat Sheng Long to stand a chance!", which was a mistranslation of Ryu's victory line and the waterfall glitch in the debug mode where Sonic turns green). Said errors were misunderstood by the fans, thinking of them as the new characters (SF fans thinking that Sheng Long is an actual character and Sonic fans thinking that the green Sonic was totally a different character called Ashura). The fans then ran with these ideas and made some backstory with them, turning them into somebody who are really close to the protagonists (Sheng Long is Ryu's teacher, while Ashura is Sonic's brother) and also have really similar appearances to said protagonists. There's a hoax about them appearing in other games as an unlockable character (Sheng Long being unlockable in SF2 and SF3 and Ashura being an unlockable character in Sonic R). Both are part of very popular mods for video games (MUGEN for Sheng Long and various Sonic games for Ashura). While they have never appeared in their game series, they both have inspired the creation of two other fan-favorite characters (Sheng Long inspiring Gouken and Akuma and Ashura inspiring Scourge and Surge). Lastly, Ashura's name is a homage to Akuma, a character that was directly inspired by Sheng Long.