Marvel Tokon: Fighting Souls has launched with a day one patch designed to fix significant performance issues, particularly on PC, that were flagged during the game's open beta. Developer Arc System Works had previously promised to address the problems, and the update also targets input lag on PS5 and tweaks certain command inputs that players found difficult to execute during testing.

The patch notes detail extensive PC-focused fixes, including reduced CPU load from unnecessary animation updates, improvements to interface performance, and fixes for issues caused by overlay or capture software such as OBS and Discord. Other changes include corrections to anti-aliasing settings, shader warm-up prompts, reduced online input delay on Steam, additional PS5 input lag mitigation, and various bug fixes covering multi-monitor setups, ranked mode display glitches, server connectivity and mouse-related crashes, alongside gameplay adjustments to dash and special-move input handling.