These two girls love Ryo, or "Ryo-sama". They made Hikari's and Akari's clothing. They also egg on the love triangle between Takeru, Mari and Hikari. They seem to have some sort of relationship with each other--accented by the fact that they nearly kissed in one episode--but their love for Ryo seems to prevail over it all. from wikipedia
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. At some points during the series she has moments that a voice talks and makes everything sound depressing.
Takeru Takemoto is this series' main character. 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.
These two girls love Ryo, or "Ryo-sama". They made Hikari's and Akari's clothing. They also egg on the love triangle between Takeru, Mari and Hikari. They seem to have some sort of relationship with each other--accented by the fact that they nearly kissed in one episode--but their love for Ryo seems to prevail over it all. from wikipedia
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 In the final episode Ryou was trying to kiss Akari, but she told him "we're family" so that Kimi wont attract them.
Ryo Ninomiya is Takeru's best friend and is something of a ladies' man, and is consistently called "Ro-baby" by Sakurako and Amika. 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.