Streets of Rage 2 - Mr.X in 30s

Streets of Rage 4 'Mr. X Nightmare' appears on SteamDB teasing possible DLC

Mr. X (Streets of Rage), Videogaming Wiki

Stream Streets Of Rage 2 - Revenge Of Mr. X (SNES Remix) by TheLegendofRenegade

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Street of Rage 3 by SaintYak on DeviantArt

Shiva joins the playable roster of Streets of Rage 4: Mr X. Nightmare – Destructoid

Streets of Rage 4 Mr. X Nightmare DLC impressions: More of a dream come true

Streets of Rage 2 Mr X Greeting Card for Sale by retrogameprints

Streets of Rage 4 - Mr. X Nightmare DLC gameplay trailer

Mr. X Nightmare and free update hit Streets of Rage 4