Eh, yeah I agree they made the characters have an interpretative nature when it comes to relations. It's really not an odd or out of place thing in Japanese media asanyone that has watched a decent amount of anime can attest to. Defintiely, Noel can be interpreted as gay and Yeul could also be interpreted as a loli. Like someone else said, I think they even blurred the lines between Serah/Snow. I disagree that there is no evidence for a Noel/Serah relationship though especially when Snow and Noel end up having a masculine clash when they first meet. lol

This happened in the first game too. There were moments for LightningxSnow, VanillexSazh, FangxVanille, VanillexHope (she practically gave him a boner when they were on the airbike and there is also a secret cutscene in grand pulse that shows them flirting)... Oh, and there is a significant community of LightningxHope shippers which I don't see much evidence for at all with the exception that they were paired together when the party splits in FF13 lol