2 girls don't make a harem. Love triangle? Sure, but not a harem. It's good to introduce new characters after awhile. Hell, we might get a guy next who becomes the main guy's best friend.
Okay I can understand the Spy x Family parents in super smash plus but the kid? She'd only have like two moves. (Also any clue who the two characters in the top right are? I know them but can't place them for some reason.