Your mltfp ideas has me like 😍😍😍. Perfection.

I could see Megatron also being a draft horse base, which brings me to the subject of flowy manes. The Unicronian corruption should make it purple, and because he was a draft horse, purple feathering. While still flowy. Dramatic AF.

Would kinda look like each step he took corrupts the ground beneath him.

... buff alicorn

Ohhhh that's so cool as hell, like. Yes. He deserves to lookm cool, and it does make sense.

Also on the buff alicorn thing that's secretly amazing because i don't think we ever see that, or any alicorns with a thicker build. Celestia looks like an elongated horse rather than a pony, I'm sorry but I'm right, and Cadence is like a mix between that and your typical pony build. It's been a while so I can't really describe her build well but it's like Celestia but shorter and almost rounder? Twilight basically stays the same until the finale where she's a lot like Celestia. Flurryheart is baby so we gotta exclude her. But we don't see any alicorns different than the princesses in the show (well we don't see any alicorns who aren't princesses in the show.) So it'd be a delightful idea to have an alicorn with a stronger build. Idk if describing ponysona megs here as a "part time alicorn" is correct here or not but it'd totally mean he's got a cool and undoubtedly unique design. so fucking cool. The feathering would be so cool as well, we only see that a few times in the show with the ponies: clydesdale addition and the hippogryphs (look it's spelled somehow in the show you get the vibe) who iicr one of these has more feathering than the other. Rightfully dramatic, perfect for a villain such as Megatron.