I think Burgh is a transexual. She was bullied as a child by Elesa and Skyla and eventually decided to undergo the operation needed to become the superior ***. Of course, Burgh is fascinated with Bug-tpes because of their ability to transform as he did.
Also, Juan, Wallace, the Striation Triplets, and Elesa are quite definitely homosexual or bisexual.
Of course, there's also the fact that random shippings can distort the sexuality, so this is just my headcanon.