Roll is Rock’s little sister, who remained a helper robot (as they both were originally) after Rock was transformed into a fighting robot. She assists Dr Light with his inventions and with housework, and on rare occasions has fought alongside Mega Man. (First and second image)

If Roll does continue into the X generation, her role would most likely be as a Navigator (a form of help which she has provided Rock before). She doesn’t have a clear parallel with any one character, but female supporting characters have appeared in several incarnations. Alia (third image) is probably her closest equivalent (second image), so with some memory-wiping and remodelling it’s possible they are the same…

Roll.EXE (fourth image) is also a support character in the Network universe, and love interest of the main character. This is another recurring aspect of this archetype, and has been slightly hinted at in the Rock-Roll relationship, and the X-Alia relationship.

Roll Caskett (fifth image) in Legends is a mechanic, helper of Mega Man and love interest. Her design and name seem to be based purely on artificially creating the parallel to the Classic Roll.

This archetype is carried through to the Zero series with the human scientist Ciel (sixth image), who later invents the Biometals but serves several support functions to Zero, and is a love interest (despite the fact that they are robot and human). Her mother invented the Cyber-elves, incidentally. She also has an adoptive younger sister who is a Reploid, Alouette, who grows up into Prairie (seventh image), the leader of the Guardians in ZX (not the same as the Four Guardians, more on that later). Prairie doesn’t have as many supportive functions but she is a possible love interest and important character. These two have no link to Roll but fulfill similar character types, with some key differences. Ciel is a brilliant and compassionate human scientist, and Prairie is a childish but competent commander.