Hey there - Lore here, fixing to pimp out my new fae fella.
This guy is the guardian of the forests surrounding Seattle, and with such an extensive territory to look after he doesn't get out of the woods much. He's almost 3/4 fae, adhering to the Seelie philosophy, and he lives wild as much as he can - sleeping in trees, eating what he can grow with his powers in the forest, etc. Any of your shifters that Run in the woods might have met him - he has a tendency to either shower attention on weres in his home, or play borderline-harmful pranks on them.
Aside from that, he might know Vaarin - the forest would suffer greatly without the rivers, and while his heart is in the trees, he has a love of the water as well, translating to a liking of and curiosity regarding the merfolk. He could also conceivably get along with Lily, being fellow fae, although he's far less human that she is and even she might find him odd.
Annika might know him as well, as she's so closely tied to the wolf pack - they're housed in the woods if I recall, and their meeting place is there too. Teagan is fond of the wolves because they are the primary predators in his forest's ecosystem, and they play a large part in keeping everything in balance. He'd love to talk to her about her divination, maybe chat with her about the pack - he's been watching it grow from afar for forty years, after all.
That's all I've got off the top of my head. See anything you like?
GUARDIAN OF THE FOREST