Branchtender Linden

 is a former member of the Outcasts from the Capital Wasteland Brotherhood of Steel. Almost killed by Deathclaws during a tech scavenging mission, he was rescued by Oasis dwellers and eventually became a treeminder.

Depending on your actions, he may give you his Outcast Power Armor before you leave Oasis.

Related quests

 * Oasis (quest)