Myuu (or Mew), in part because her aura power deals with fire, is afraid of the rain to the point she will miss days of school when it is raining and possibly suffer panic attacks if forced to be out in the rain. She is distant, even to the point of slight rudeness, because of a traumatic experience in her past: during her childhood, her mother was killed during an Aura experiment. The explosion caused the lab sprinklers to go off, showering her shocked self with water; this caused her dislike for rain.  With her friendship with Orina and Ai she slowly begins to warm up. Myu shares a bond from childhood with Ai, though neither of them realize this bond at first  

Insecure Ai Shiomi begins attending the prestigous Psychic Academy for psychically gifted students, following in the footsteps of his legendary older brother.
 
(Source: Anime News Network)

Zerodaimu Kyupura Pa Azalraku Vairu Rua Darogu (a.k.a. Zero) once stopped the evil demon lord with his incredible psychic ability, and in the process saved the world from destruction and earned the honorable and highly imaginative title 'The Man Who Stopped the Evil Lord.' 
Now, he has accepted a position as a teacher at Psychic Academy, a school for gifted psychokinetic youngsters who have demonstrated incredible raw powers and want to learn how to hone their abilities. Among the student body is young Ai Shiomi, Zero's little brother, a somewhat meek boy who, despite parental prodding and his fraternal reputation, feels that his limited skills hardly justify his presence at the prestigious academy. 
However, everyone else is convinced that he, like his celebrated brother, is destined for greatness. A lot of pressure for a boy just entering adolescence! 
 
(Source: Tokyopop)