There was the whole Chisato-Lesbian thing in November 2013 or 2014, but I don't think that was ever really proved to be real.
Fuku-chan? Because she's very clingy with all the girls? Well, why not! 
To me, it's Riho, of course, Ayumi, Erina, Haruka, Take-chan, Chisato and Yaji (she's such a player! :b )
Honestly all the "lesbian" characters end up getting married and having kids sooner or later lol. You could say Kudo but she'll probably get married and have kids one day it's just her character same for the other sporty boyish girls or clingy girls. Fuku would probably be very low on my list if I was to make a list of girls on the current roster that could possibly be gay. Lots of girls hug each other and stuff at that age doesn't mean they are close to being gay.
Maybe Ayumi or Erina. Take likes One Direction and stuff like that so she's probably into guys despite her boyish look and character.
Yossie was about as close to a lesbian as any idol in H!P has seemed and she married a guy so if we are wishing for a real lesbian idol we are probably going to be let down .
before it crossed my mind that some might be lesbians but now it's not... I can imagine all of them happily falling in love with the right guy at the right time, marry and have cute kids they'll someday bring on tv and show us
Hhaha. I think It's Chisato,RihoRiho,Ayumin,Duu 
srcToday’s handshake event
Me: Yamaki-san, what kind of music do you like?
Yamaki: Eh, what kind of… girls… do I like? No, um, what should I… that’s, um…
Me: Ah, I said your favourite music… (embarrassed)
Yamaki: O-oh, music… (embarrassed)
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What makes you think she's a lesbian? I mean I totally get you when you say you just get those vibes from her, I know what you mean, but I've never really seen her that way, never had that suspicion. So the gayest member as of now? I don't think we could know or guess without context, to be honest. My guess would be none of them?