I know "Shigeru Cycle/Shig Cycle" has to do with him but who is he? I'm not hugely active in this scene, so someone explain plz.

I don't really know, but it might be referencing Shigeru Miyamoto, the creator of Mario. (And lead producer od every Mario game I think)

Shigeru was an old mario 64 speedrunner, Infact he has 16:16 time in 16 star

Sorry for the necro. Shigeru was an old speedrunner. He got a 16:16 time in 16 star, and is the first known person to get a 1 star run on console, with an 8:17 from May 4th, 2010.

@KoopaKaper he did not produce Super Mario Land

Also shigeru choked 15 so hard in sky lmaooo