The second companion, you will encounter her a short distance away from Seelah. This holy blade can only be wielded by a Paladin and is the ideal weapon for her, especially since it can be upgraded during the course of the game. After you solve the color gem puzzle in the Shield Maze, you will be rewarded with the longsword Radiance.
Her Paladin abilities are well suited for combat against demons and other evil creatures. Of course, that also makes her alignment Lawful Good by default.
The first companion you will meet in the game in the Kanebres underground, Seelah is a Human Paladin.