In Tenma's case, she likes someone that isn't near-identical to her. Harima likes Tenma, though, so they're not quite like Karasuma and Akira seem to be (attracted to people different from themselves). However, Harima doesn't seem to know how similar he is to Tenma, so I think his attraction to her isn't due to them being similar people.
Yakumo clearly has some daddy issues in Chapter 174, so I am serious when I say they might be connected to her relationship with Harima considering she made a connection between her father and Harima, herself. I've never suggested they might be related, though.

