Oh man, the fact that you managed to get Peter shadow at all is extremely lucky. See, Peter shadow was normally an Easter egg for people in multiplayer playing with the now broken movie night mod, which allowed people to set their Animation to any vanilla "pose" in the game via a chat command, and also showed what players are currently spectating you through small versions of their characters watching in the corner of the screen, as if its a movie, hence the name. The reason that Peter shadow showed up is because Mario is an extremely well optimized mod, which opts to use vanilla sprite names for all his animations instead of taking the easy route and just defining new ones, for maximum mod compatibility. How you would normally get Peter shadow with movie night is by using the pose command to set his animation to one that he cannot otherwise access, which if I remember correctly, is tails' flight frames. Mario just so happened to also use the flight frames for his ground pound, hence that happening. I know you probably don't care about the technical explanation for why that happened, I just thought I might as well share the reasoning since I'm someone who knows way too much about this game's internal working, lol.
So I know Peter Griffin shadow was already a highlight but something about calling Mario's "it's a me mario" a warcry and immediately killing fang and metal sonic as kirby was also a pretty standout moment for me.
Almost every time Kirby shows up, something hilarious happens. That's great. The highlights are when Garrulous said he wanted to remove Mighty from the universe, and then Kirby shows up right on cue, guess what happens next. The other was when Fang fricken died.
The amount of times Mighty switched in right as you were flying/hovering is so unlikely i love it, it happened with Tails specifically a LOT, really fun video!