Neberu is a character Coen can meet and speak with. Very little about Neberu is documented yet, but the wiki lists Neberu as one of the few known Dawnwalkers.
Neberu's background, home and quests are not covered by the sources yet. What is known is that Coen can meet and speak with Neberu.
The wiki lists Neberu as a Dawnwalker, like Coen and Saint Mihai. Dawnwalkers are human by day and vrakhir by night, age very slowly and can live for centuries.
Albertus Taurinus
Albertus Taurinus is the in-world author of The Secret History of Vale Sangora, the lore series Rebel Wolves posted before launch. Read it if you want the valley's backstory before you start playing.
Image: Rebel Wolves / Bandai NamcoAlin
Alin is Coen's younger brother, who drowned as a child after falling through cracked ice. You never play alongside him, but his death shapes Coen, his mother Esme and the quest Home Sweet Home.
Image: Rebel Wolves / Bandai NamcoAndrei
Andrei is a silver trader in Svartrau who works out of a hideout behind a butcher's shop. He is the man Ocha wants dealt with in The Heart Wants What It Wants, and how you handle him shapes her ending.
Ascar
Ascar is a beekeeper who lives in a hut on the south side of Tantari. Crake has you tail him in the optional quest Distant Shadows, and what you find out explains a lot about Crake.