According to "The Lost Tales of Ornn" some guesses

Seal Sister <-- sister of Ornn? looks similar to - ofc - a seal? maybe she lives near the sea of Nami's tribe?

we may speak later of the bearskinned storm-bearer <-- i know Reav3 already stated this but there is the leak for his VGU

We have Voli, Anivia, Ornn and the Sealsister. Who else might be Ornns siblings?

Is Volibear his true name? cause neither Anivia nor Ornn have their spirit animal in their names.

she (Anivia) tickled his nose with one of her feathers <-- VU for Anivia? i mean, frozen feathers dont tickle ^^

Grubgrack <-- maybe next troll champ? Trundle needs some troll siblings. ^^

Hearthblood <-- was Doran one of them? did they craft the Darkin weapons?

"Hammer" <-- next new OP-item?

And then: Then he turned east and threw his favorite eating fork as far as he could. It landed in the Great Sea. Some say, later, a mer-king found a powerful trident at the sea-bottom, and still uses it to rule his kingdom. <-- i dont think its Fizz's trident. Maybe some ancient king? Maybe another hero-teaser?

Just some thought which came into my mind, when i wrote this cool, atmospheric story.