Takemoto Takeru
He comes off as a lazy and unmotivated teenager, but is really just unsure of his place in the world. He was the one to find and name Hikari in the first episode. He can transform into a powerful being with superstrength and sharp appendages. He has an apparent love interest in Hikari, blushing and getting flustered when near her, and eventually admits he likes her.
Hoshino Hikari
Hikari is a girl whom Takeru finds in the forest and falls in love with in the first episode. Hikari also likes Takeru ever since they met as well. She is very cheerful and thinks that almost everything she sees is wonderful or incredible. However, not much is known about her.
Ryou Ninomiya
Ryo Ninomiya is Takeru's best friend and is something of a ladies' man. He finds Akari sitting alone by a lake, and later gains some sort of power over the elements similar to how Takeru gained his powers shortly after meeting Hikari. He found Akari and takes her in as one of his family members. Ryo does have feelings for Akari, but Kimi keeps the two from having any sort of relationship.
Nishino Mari
Mari Nishino is Takeru's cousin. She has a habit of always nagging at Takeru for various reasons, and often the two are at odd ends. Despite this she appears to have fallen in love with him, and is very envious of his relationship with Hikari. She is still nice to Hikari and helps Takeru.
Akari
Akari is a young girl that appears just as mysteriously as Hikari. Ryo finds her and makes her part of his family. She often thinks of Hikari as her older sister. Akari is very fascinated by living things like Hercules beetles. Akari would have had feelings for Ryo, if Kimi never kept saying they were a family and nothing more.