Tristan Wren is the brother of Sabine Wren and a son of Clan Wren, voiced by Ritesh Rajan in the third season of Star Wars Rebels. He served with Gar Saxon's Imperial Super Commandos — a posting the family accepted as the price of Clan Wren remaining intact after Sabine's defection.
He is a small part with a specific job: to show that collaboration under occupation is usually a family arrangement rather than an ideology. When Clan Wren turns against the Empire, Tristan turns with it, and nothing about the switch is presented as difficult.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.