M.U.G.E.N is a fighting game engine developed by Elecbyte starting in the late 90's and halted (as of right now) in 2015. It is fully customizable in various aspects from screenpacks to lifebars to stages and characters. There are several versions: DOS MUGEN, Linux MUGEN, WinMUGEN (with a modded hi-res version), 1.0 and 1.1, the latter three which are still supported by the community. For more info, check Wikipedia or the MUGEN Database.

I actually started playng in 2013, during the 1.0 era. I wasn't the best at fighting games, so I was a bit rusty until I played more and more with various styles. 1.0 had been my main version since 2013, but I switched to 1.1 in 2021. I started making content around 2016, which were mostly just poor edits, started the YouTube channel in around 2017, and took creating for the engine seriously in 2020.