Quin

Quin is a relatively young Selkie. His full name is Quinlan but he goes by Quin because he may be dumb by human standards but he knows better than to give out his full name to strangers. He dyes his hair because his Animal Crossing Pocket Camp avatar looked really good with blue hair that one time he accidentally clicked it.

History
Quin is the grandson of the previous leader of the Newfoundland Harp Seal Selkies. His aunt is the current leader. Several years ago, Danny Kim visited on his quest for whatever the fuck it was to save the world and Quin may or may not have given him the Selkie treasure to "borrow", not realizing Danny was going to throw it into a fucking volcano. Quin is now in the hot seat for, you know, giving their most treasured artifact to a human and losing it forever. He is now on a quest to find a new treasure and regain his standing among the Selkies; however he mostly spends his time hitting on attractive men or making Very Bad Decisions (TM).

Relationships
Quin is generally distrustful of humans but wholeheartedly embraces any supernatural person he meets, whether or not they are deserving of that trust. He tries Real Hard to learn about humans (with the help of Hazel and Jackie) but there have been several missteps. He is Officially Dating Danny Exclusively and loves everyone else at school.

Some Shit About Selkies
From the wikipedia page: "Male selkies are described as being very handsome in their human form, and having great seductive powers over human women. If a woman wishes to make contact with a selkie male, she must shed seven tears into the sea. If a man steals a female selkie's skin she is in his power and is forced to become his wife." Shit gets real complicated if you're queer.

Selkies generally live around 300 years. They don't have human souls, so they aren't reincarnated. They just sort of--cease existing. The only way to gain a human soul is to make a human fall in love with you.

Selkies live as seals but can shed their pelt to live as humans. There is a chronic issue with humans stealing said pelts and forcing them into relationships. However younger Selkies have sort of started embracing this as a way to have a human soul and live forever through reincarnation. It's not uncommon for Selkie Millennials to actually seek out humans to devote themselves to in hopes of becoming human. Older Selkies frown upon this because humans are actually really, really terrible. There is a long-standing grudge not only about the forced marriage thing but also about the fact that humans kind of kill baby seals and wear their fur.

Selkies have a genial relationship with other mythological creatures but generally think humans are full of shit.