Toulouse, also known as Truth, is the King of Sunny Kingdom. He possesses short, dark blue hair and gold eyes in the anime, though original concept art gave him sea-green eyes like his daughter Rein. His attire is typically regal, featuring a blue and white mantle over gold and white clothing.

His personality centers on being a caring father and a fair, dedicated ruler. He consistently worries about his twin daughters, Fine and Rein, especially their frequent unexplained absences, yet maintains belief in their good intentions. He exhibits a bashful demeanor when recounting his romantic past with Queen Elsa, particularly his proposal with a bouquet of Dream Seed flowers. He is also protective, especially of Rein when pursued by Prince Fango.

Biologically father to Fine and Rein, Toulouse shares a family dynamic where Rein inherited his blue hair and sea-green eyes in the original concept, while Fine inherited Elsa's red hair and eyes. His marriage to Elsa is loving, marked by his courtship gesture of gifting Dream Seed flowers during his proposal. Background details regarding his ascension to kingship or life before marriage remain unexplored.

Within the narrative, Toulouse primarily supports the twin princesses' mission to restore the Sun's Blessing. He governs Sunny Kingdom while managing parental concerns over Fine and Rein's safety during their adventures. His leadership involves maintaining stability across Wonder Planet's seven kingdoms, though specific political strategies are not detailed. He remains a steady, supportive figure without significant personal development or conflict. His appearances in the manga adaptation are minimal, confined to two brief chapters with no substantive plot involvement.

Toulouse maintains a consistent, peripheral role across all confirmed media, with no official information regarding his presence or development in sequel series like *Fushigiboshi no Futagohime Gyu!*, spin-offs, films, or OVAs.