Jean-Jacques Francis de Wardes
Wardes is Captain of Tristain's Griffin Knights and Louise's former fiancé. When he was younger, he often met Louise, who was feeling down after being compared to her sisters. He is a highly skilled swordsman as well as mage.
He is later revealed to be evil as he betrayed Louise and attempts to mind control her in marrying him (Because of this, many people think he is pedophile, although the correct term would be ephebophile, and both the novel and anime implies that he is aware of Louise's potential as a Void Mage and interested in her primarily for that reason). He then kills the Prince of Albion when his attempt is revealed.