Yeldyria, we saw that bluuush~
But honestly though, I do like Robia- he might be the only one in the harem that actually joined because they loved Yeldyria, and then she just played around with him. It does feel like he has some important piece of information, and as weird as this sounds, I trust him more than Eclot and Nadricka (though I like them more), since it doesn't feel like he's hiding something. His motivations are as clear as day lol.