Ooo lore time!
Sexuality wise I imagine him to be omnisexual since his species sees gender differently + the flag is pretty!
His favourite food is those curry bowls you dip naan bread in (idk the name).
His animal resemblance is a grizzly bear!
He was pretty sexually active in his youth (20s) when he was starting up his merchant guild and getting Around. Even slept with Naya a few times. He never really devoted himself to anyone until he met Parvita (early 30's) and eventually the poly~
He had a fear of heights as a kid (ironic given his hometown) since he was a chubby kid and landings were hard. Seeing Naya effortless leap about even without wings helped him get over that.
Den is totally the dad who falls asleep watching tv, then immediately wakes up when someone touches to remote and grumbles that he's watching it.