Yuuno Scrya

Before the start of the series, Yūno lived in Mid-childa, a magical world, as an archaeologist. He had no parents, so was raised by his entire tribe, the Scrya, from which he took his surname. He also obtained or created the intelligent device Raising Heart around this time, but his talents lay as a support mage, and so his attack abilities were low and he never made the device into a weapon. Yūno first appears running from a gigantic monster in the woods and attempting to seal the Jewel Seed inside it with Raising Heart. He fails, letting the monster get away, and collapses wounded on the ground. Yūno uses his remaining power to call out to the nearest magic user and turns into a ferret. His call was heard in Nanoha Takamachi's dream, and later that day, she found the ferret in the woods and took him to the veterinary hospital. He quickly recovered, taking a liking to Nanoha and recognizing her as a possessor of the magical aptitude, a rarity on Earth. Later that night, he calls out to Nanoha again and she leaves the house and finds the Yūno-ferret cornered by the same monster. He entrusts her with his weapon, Raising Heart, and seeing her raw power when she activated it, deduces that she can create magical armour and turn Raising Heart into a weapon of her design. She does so and begins her journey to seal away Jewel Seeds. It turns out that Yūno discovered the Seeds on an excavation, but officials of the Time-Space Administration Bureau lost them on Earth. Though Yūno searches for the Seeds while Nanoha is busy, and though he fears that she is too inexperienced, he quickly recognizes that she is more powerful than anyone he has ever seen. When Fate arrives on the scene, Yūno begins to fight Fate's familiar Arf while Nanoha is busy with her rival. This is the first time that Yūno is referred to as Nanoha's familiar, but Nanoha replies with "We're friends," a line later echoed in the first episode of A's, under different circumstances. This whole time, Nanoha is unaware that Yūno is a human male, leading to a running gag of some embarrassing situations with girls changing and especially during the onsen episode, and every time he panics and looks away. In episode 8, though, Yūno reveals his identity to Nanoha.