The character's sprites are taken from various sources, with the chicken being a Cucco. In M.U.G.E.N, Skeleton with AK-47 on Giant Chicken has been made by RoundOne according to the creator, he made the character after reading one of the video's comments saying that the skeleton with an AK-47 riding a giant chicken, which was featured in the video, should become a character in M.U.G.E.N.
The mods which the character is derived from were featured in a video by Vinesauce streamer Uncle Joel, which covered various Skyrim mods in the video, a mod is added that enables the game's skeleton enemies to become a playable race, as well as various other mods that added various additional objects to the game, including Lightsabers, giant chicken mounts, and AK-47 assault rifles.
Skeleton with AK-47 on Giant Chicken is a character inspired by a collection of various mods for The Elder Scrolls V: Skyrim which, as the name suggests, replaces the model of the player character with that of the game's skeleton enemy riding a giant chicken while armed with an AK-47 assault rifle. Bethesda has done all the function already by reusing the skeleton design from skyrim without transforming anything about it so that provides permitted me to. While still pretty early in development with some bugs (listed below), it is a fully functional, working mod. Make sure all boxes are checked in the import dialog. Not sure how much the settings matter here, but be sure 'import skeleton' is checked.
Image of a skeleton with an AK-47 from the thumbnail of Vinesauce Joel's Crazy Skyrim Mods video 'Skeletons: A Playable Race' allows the player to choose to play as an extremely spooky skeleton, a race complete with its own unique traits, voice, and abilities. You may have to use your BSA unpacker again, this time on 'Skyrim - meshes.bsa', to obtain that file.