u/PortersonaOffical

-Both are spinoff sequels to notable video game series (Megaman X and Metal Gear Solid)

-Both focus on the secondary sword wielding hero (that people say look like a girl) who continue fighting even after the death of the previous protag.

-Both are some sort of technological being common in Sci-Fi. (Android | Cyborg)

-Both would gain a new body/design that would become just as iconic as their previous design (debatable)

-Both would fight in a wartorn world that is a result of the past installment's events.

-Both games change a lot gameplay-wise from their predecessors and focus on sword-based combat with a ranking system at the end of levels.

-The most notable bosses from the games are a group of four powerful enforcers that are tied by a theme/motif. (Four Guardians | Winds of Destruction)

-Said group have members with similar vibes. (The notable one with red swords that's your main rival, the warmonger associated with heat that duel-wields multi-purpose weapons, the only lady who's flirtatious and who's associated with ice and wields pole-arms, and the ninja whose utterly loyal to something)

-One of the main villains is an insane dude that is made of nanomachines that heal and protect his body.

-Both protags find out what they are really fighting for.

- The final boss/bosses in Zero's case are archetypes/tropes we've seen from the previous installment. (Armstrong being similar to Solidus, Omega filling the "Evil Zero" trope, Weil being like an even more evil Wily plus some others, etc)

-I would have said less popular than the previous installment but I'm pretty sure MGRR is more well known/exposed than MGS nowadays so...

…It’s Mars!

(Artist: Clinick)