I think that you can maybe justify Haru's popularity with the ladies by logical extension of his Silver Crow persona.
In other words, I can see somebody like Pard, say, taking a liking to Silver Crow just because he's a very good burst linker with a big (and largely good) reputation. Silver Crow might not be on the level of one of the color Kings, but he has become a pretty big deal in the Accelerated World. The anime makes this clear a couple times.
Once somebody becomes a bit of a "rock star", the importance of their physical appearance can drop dramatically.
So it's not necessarily that these girls are all into Haru. Many are probably just into Silver Crow, which benefits Haru by extension. Imagine a girl who thinks that Spiderman is really cool - If she finds out that he's Peter Parker, she's probably going to like Parker even if he's not her type physically.
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