I still don’t get why. All reploids were created based on X’s design. So why don’t they all look relatively human like X, Zero, and Sigma?
It’s just a gimmick to differentiate it more from Classic I tell ya.
You want a sorta in-universe reason?
Certain Reploids are built with specific purposes, despite the free will they are programed with. Likely because while Mega Man X himself was built to be as real as a person is (to the point of having a digital soul), most others were likely built that way solely because the tech is powerful and new. So the free will is almost just a consequence of aping MMX. This is part of the reason Marvericks exist, as they didn't go through the ethical training MMX did(for 30 years, it's supposed to take a normal human about 7 years to "really get" empathy at the most before it gets worrying). The other reason is Wily being Wily, lmao.
Most bystander reploids ARE human shaped. Look at the NPCs in Command Mission for example. The bosses just get to share a thematic element.
The animal theming isn't exclusive to Mega Man X, as it carries over into MMZ/MMZX. So it's just a
thing in a LOT of Mega Man games at some point. Human looking bosses, such as Vile, Dynamo, Bit, Colonel, Ferham, Berkana ect. having higher ranks in a narrative sense.
Water themed Reploids being based on Octopi/Crabs/Stingrays/Whales isn't that strange. Nor a lot of flying Reploids being based on Birds or Bugs. And while the mind is human like, the body doesn't necessitate that, and strictly limiting themselves to human designs limits creativity/functionality.
Also, it's just cool.
No, a pistol evolves into a tank.
There's gotta be a
reason for cow to become sheep. Pokemon has to make sense, damnit!
I feel like a middle evolution where it's a shotgun of some kind is missing. But really, it's one of the stranger changes, since even the color scheme doesn't tie the two together.
But there's always the chance to make a third form a giant Kraken suspiciously shaped like a Nuke. Or a Flying type regional variant based on a military drone.
If you're doing something like a cow into a ram. You'd likely play into the horns or climbing rams can do, but why wouldn't the last form be a kid I guess?