Thin-skinned arrogant pretty-boy --> adoring fan arrogant pretty-boy (NEW!)
I don't think he'll ever act malicious, he's just not reliable nor thoughtful. If anything he'll try to force Mitsuki and Aya to close the distance and laugh at the results.
That boy needs to find himself a boyfriend instead of interfering. I get he probably just admires stylish manly people for their craft, though...