Aka-san ("Mr. Red") is the baby face that appears in Gachimuchi videos.
As many of the Gachimuchi characters may appear naked, he often appears to censor their private parts.
- The original Aka-san meme was used as an image macro (similar to the Advice Dog and related memes), which begins with a kind remark devolving into an insult, ending with the words "Masani Geidou!" (まさに外道. "Downright heresy!" or "Shame on you!"). Its humorous element of a happy baby's face against a strongly insulting comment caused it to become an amusing meme, mainly because his appearance shames the viewer for watching clips that are lewd.
- The baby who appeared as the "Aka-san" face appeared in the trailer for the 2017 International Wrestling Festival, as a young man.