For literally any random/joke theory. From Super Mario, Deltarune, to even Celeste, you can make any funny theory you want…as long as it follows the CGs.
One Deltarune random theory:
@Odinthec00lkidd made a random theory that Mequot is The Roaring Knight. The theory details that, as stated above, MeQuot is the only one who can pull out the sword in his chest. Odin claims that this connects to the knight, saying how the Knight's chest opens up. He also details how both characters use their own weapon. However, because evidence is lacking and weak, not to mention it's a joke theory, MeQuot is often regarded as a Sub-Knight.
-Deltarune Topic Wiki

bro didn't the last theory topic get closed….

bump

wait is there a celeste topic?