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X. Like MegaMan, though the artstyle may change, his anatomy remains very consistent. The only major difference is that the pectoral plates on his chest went from dark blue to lavender. Some concept art shows it as light blue, but all modern official art shows it as lavender.
Bass. Of all the characters, he is the least consistent. His gem shape and color on his chest and head seem to change from artist to artist and between games. The size of his fins is also wildly inconsistent, but the shape is mostly the same.
Roll also had some battle armor for the MegaMan OVA and MegaMan 11. For fun, here's a totally unrelated Sally the Witch screenshot.
Theres not much art of MegaMan 11 Roll, so here she is in various outfits
MegaMan Powered Up Roll is just Classic Roll but squishier.
ProtoMan has multiple hair styles. All are valid, but most people seem to love his crazy pompadour which is his most recent design.
ProtoMan (his buster is a bit inconsistent in older art, but these seem to be the most common design)
Some versions of Rock in various outfits. Also this lovely piece by Inafune of Rock being repaired.