Klarth F. Lester

Klarth F. Lester (クラース・Ｆ・レスター, Kurcāsu F. Resutā) is one of the main (and playable) characters in Tales of Phantasia, the first game in the Tales series. His seiyuu (Japanese voice actor) is Kazuhiko Inoue.

Klarth is 29 years old and from the town of Euclid. He has spent his life studying the use of “contract rings” to be able to bind with elemental spirits (such as Undine) and then Summon them.

His name was localized as Claus F. Lester in the Gameboy Advance remake of Tales of Phantasia.

Role in Tales of Phantasia
Spoiler warning: Plot and/or ending details follow.

Klarth joins Cless and Mint on their journey to defeat Dhaos. At first he was hesitant to join them, but after hearing their story and plea for help, he agrees, using it as an opportunity to harness the power of Summoning.

Spoilers end here.