Russ is a character in The Legend of Zelda: Breath of the Wild. Russ is a Hylian Shield surfer who sells Shields in the Eldin Canyon region of Hyrule under a tree on a hill near Trilby Plain. The hill itself is a good place for Link to practice his shield surfing skills.
He is best friends with Fin who camps out at the foot of the hill and will transports Link back to the top of the hill if he talks to him to continue shield surfing.
Russ sells three types of shield and once he sells a shield to Link it becomes sold out as Russ is unable to acquire replacements to restock, thus Link can only purchase each type only once. The strongest shield he sells is a Knight's Shield.