>>54611369here's my hypothesis
they think larry would like rika because he's bored and jaded and rika is interesting yet down-to-earth so she can... I guess help him enjoy life without demanding that he be happy for her sake
they think rika would like larry because she's Sad Inside(tm) and larry is emotionally stable (in his own way) and prepared to see her at her worst
the idea of a girl being nonjudgmental about a guy being boring as fuck, or a guy being nonjudgmental when a girl isn't perfect and pretty... that rings with people, they like that
I'm not 100% confident in this hypothesis, but eh