Name- Ageha Yoshina
Appearance- normal: [img=http://cdn.myanimelist.net/images/characters/5/107356.jpg]
Nova: [img=http://static.comicvine.com/uploads/original/2/27620/3056747-8341421651-208b4.jpg]
World- Psyren
Powers/Weapons- Melchsee's Door: there's only really one explanation I can give for Melchsee's Door. It's a large ball of energy that targets, and attempts to devour any psychic energy nearby, so anybody that's using their powers while he's using his will almost certainly be killed by the ball.
Melchsee's Lance: a miniaturized Melchsee's Door that is launched at extremely high speeds towards a nearby source of psychic energy.
Melchsee's Disk: a disk form of Melchsee's Door that is used more fore defense than offense, and is moved in the way of any attack that is targeting Ageha and devours that attack.
Melchsee's vortex: well, um, just read the section for it in this link: [url=http://psyren.wikia.com/wiki/Ageha_Yoshina#Burst]
Rise: enhances his physical abilities
Mind Block: this is more of a personality trait than a power, but it is very effective when fighting opponents that can read his mind. Due to his innate capacity to succumb to his own fighting spirit, Ageha can "lose himself" in battle and fight completely without thinking.
Nova: well, basically add flight, coat him in the energy of Melchsee's door to kind of form an armor that absorbs energy, and...make his powers so much stronger that 
Other(optional)- If you want to see what the versions of his attacks that are upgraded with Nova look like, just click [url=http://psyren.wikia.com/wiki/Ageha_Yoshina#Nova]here[/url].