Rendi is an adult female Tordenchi standing at nearly 16 metres tall and weighing 68 metric tons. She is Friendly, energetic, and naturally curious, she has always dreamed of exploring the galaxy and meeting unfamiliar species. Her fascination with space began during childhood, when her mother, Mirella, would tell her stories about distant worlds and civilizations.

An adventurous spirit, Rendi enjoys exploring, parkour, working out, and spending time outdoors. She loves learning about other species' cultures and customs, often becoming overly enthusiastic when discovering something new. Despite her enormous size and strength, she can occasionally be clumsy, particularly when interacting with much smaller beings. She genuinely tries to be gentle and dislikes accidentally hurting anyone.

In 2018, Rendi travels to Earth, one of the newest species in UTO. Having heard about humanity's resistance against the Rynar invasion in 2016, she is fascinated by how humans used their unconventional fighting tactics, alongside UTO assistance, to fight back against the invaders.

However, nothing prepares her for meeting a human face-to-face. Accustomed to looking up at practically everyone around her, Rendi is absolutely flabbergasted by just how tiny humans are. Naturally, she becomes eager to learn everything she can about them.