Rei Lucas (レイ・ルーカス) - The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible (Shinmai Ossan Boukensha, Saikyou Party ni Shinu hodo Kitaerarete Muteki ni Naru.) (新米オッサン冒険者、最強パーティに死ぬほど鍛えられて無敵になる。)