There a similarity between Stan and Ochaco
Both of them vomit
Both of them have a crush (For Stan, its Wendy while for Ochaco, its Izuku)
Both wear eyewear in their hero costume in a way. (Stan wears yellow safety goggles as his alter ego Toolshed while Ochaco wears a headgear that involve a visor covering the face.
Both are roundheaded (Its obvious for Stan to be roundheaded)
Both of them wield humongous object once. (During Ochaco vs Tenya, Ochaco can be seen holding a giant pillar affected by her ability during the fight while Stan as his alter ego Toolshed holda a humongous drill in his ultimate in the game TFBW)
Both of them incorporate the color brown (For Stan, it's his jacket while for Ochaco, it's her hair.)
Both sometimes show sign of jealousy when their crush is interacting with someone.
Both them have a relation to construction (If i'm correct, Ochaco parents are stated to be construction worker while when Stan use his ultimate in TFBW, the background ressembles a construction site.)
Both of their mothers have brown hair.