Ristarte

Ristarte, called Rista by most characters, is a goddess tasked with saving the S-Rank world of Gaeabrande from the Demon Lord. To do this, she summons Seiya Ryuuguuin to be the world's hero. She is the supporting protagonist in Light Tuchihi's and Saori Toyota's The Hero is Overpowered but Overly Cautious series.

Personality
Ristarte is less confident in her abilities as a goddess than many of her fellow deities, which is a core part of her personality.

Rista tends to rely on tradition and cliches when she's unsure of what to do. This led to her summoning Seiya to become a hero, as she saw that he was Japanese and had above-average stats. Although she would later regret this decision, as he breaks many of the traditions common in isekai stories.

Rista also cares deeply about the lives of the citizens of Gaeabrande and hopes to save as many as possible. Due to being a younger goddess, many of the other deities treat her like a younger sister or child.

She has been shown to be quite perverted, primarily with Seiya.

History
She was originally a healer named Tiana, who was a princess of a country known as Termine in the world of Ixphoria. She joined a party in order to defeat the Demon Lord and was very close with its leader, Seiya. Despite Seiya being very reckless, she still felt at ease when he used his catchphrase "Everything's gonna be okay". During the fight against the demon lord, it was revealed that she carried Seiya's unborn child and was killed alongside the baby.

Due to Ariadoa's guilt, Tiana was then reincarnated as the goddess Ristarte 100 years before the start of the series. She trained as a goddess to save worlds fated for destruction, until she tasked with saving the S-rank world of Gaeabrande.

To complete this assignment, she summoned Seiya to aid her without considering his bizarre personality. She does her best to accommodate his overly cautious nature, but usually grows frustrated with the summoned hero.

After Seiya saved Gaeabrande, she overused her Order powers to save him from dying. This caused her superiors to issue a punishment to her and thus was tasked with saving an SS class world without her powers.

Seiya
Ristarte is attracted to Seiya but is often annoyed with his abrasive personality. Seiya however, doesn't reciprocate these feelings at first. He often insults her and abuses her role as a goddess. Her hair is often stolen by him for use in his Synthesis skill.

Trivia

 * Her name is possibly meant to sound like restart, which may hint to the fact that she was once human and has been reincarnated into a goddess, thus giving her a 'restart'.