Ioneos is like Kuon's "older brother," as he and Kuon are created from the same type of magical crystal. However, Ioneos' appearance and size are much larger and sleeker than Kuon's because he is comprised of an entire crystal, save a small chipped fragment which Kuon is made from. He was sealed inside of one of the school's stone pillars until Hikari accidentally released him during a routine fire drill. The entire school was subsequently demolished after the blast following Ioneos' release. Jennifer nicknamed him "Oniita," saying that his original name was too long. In the end, Ioneos turns into mud along with Kuon and become crystals. Kuon being the little chip and Ioneos being the big crystal. Jennifer puts them on a necklace and wears the crystal. from wikipedia
Jennifer Portman is a crazy American super-scientist who came to Japan to study the "Extended Definition", a species' ability to prevent its own extinction, which usually manifests itself in said species transforming into a monstrous form that maximizes its combat potential, and gives it the instinct to attack or kill Hikari. She moves in with Takeru, Hikari, and Mari. She's rarely to be seen without some kind of alcohol and is somewhat of an exhibitionist. Although out of work she appears ditzy and idiotic, she is extremely intelligent at her work. from wikipedia
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.
Shinichi Asakura and Daijirou Matsumura are schoolmates of Takeru who seem to always be dreaming up some kind of perverted fantasy, especially once they met Hikari. from wikipedia
Shinichi Asakura and Daijirou Matsumura are schoolmates of Takeru who seem to always be dreaming up some kind of perverted fantasy, especially once they met Hikari. from wikipedia
After being captured together, he marries Suzu.
During their marriage he is drafted into the military.
After the military is dissolved, Suzu and Shuusaku return to their home with a child found roaming a devastated Hiroshima.
A well mannered young woman from Hiroshima.
She loves drawing and her family.
After being captured by a "monster" she marries Shuusaku, and they live together with his family.
After an air raid on their way back from visiting the hospital, Suzu and Harumi are caught in an enemy explosion. It kills Harumi and wounds Suzu, who loses her right hand.