Although Lenneth doesn't actually appear as a character, Rival, the main antagonist, takes Lenneth's appearance during the third stage of the final battle, and can even perform Nibelung Valesti.
- Main article: Lenneth (Star Ocean 3)
Lenneth appears as a superboss in the third installment of the main series, ranking 3rd in top difficulty. It is suggested to be the same character in this game as the one from her original series (though her appearance as a child is actually a spoiler from Valkyrie Profile). She can be found in Sphere 211. Although the artwork depicts her without her armor, she quickly obtains it before she engages Fayt and his friends.
Lenneth makes an appearance as an obtainable character. She is voiced by Yumi Tōma. Her artwork is illustrated by Kou Yoshinari. Lenneth's rush combo is her signature attack, Nibelung Valesti.