For what it's worth, when I called Bubbles "Fayesexual" I was simply pointing out that there's not enough data to generalize. Faye is literally the *only* indication we've had of Bubbles' romantic attractions. It's not denying her a label or an identity, it's just pointing out that whatever label you give her, other than acknowledging her relationship with Faye, is as likely as not to be wrong.
I wouldn't call Faye "Bubblesexual" in the same way; Faye has gone through feelings of attraction to several people, all male. Based on the evidence right up until the current relationship she thought of herself as a straight girl; she still has no developed identity as bi or lesbian yet, and has not been subject to, or called on to deal with, any of those issues yet. Based on what we've seen so far, I'd say she's mostly-straight, and Bubbles is an exception to the usual for her. What she develops into the future? I dunno. Bisexual, possibly? Straight with one confusing and wonderful exception? possibly. In a state of angst and confusion and perhaps cognitive dissonance over a shift in her own perceived or self-identified gender preference? Also possibly. I'm waiting for the author to tell that story.
I don't know if this is a real thing that's borne out by scientific evidence or not, but from personal experience, I've known several women whose gender preference in partners broadened as they got older. Among people I know, there are more than a few formerly exclusive lesbians and formerly exclusively straight women who either discovered one or two very confusing exceptions, or outright became to some degree bisexual, as they matured. But absolutely no exclusively-straight or exclusively-gay men of my acquaintance have gone through the same thing. I wonder if this is just a small-sample coincidence or if there's a genuine skew there?