Reizo is an old friend of Kaia's from Shenkuu. After getting letters from her in Faerieland, he decided to visit her. However, he ended up freeing and getting cursed by the Darkest Faerie and transformed into the creature known as Malum. The curse was partial, allowing him to regain his senses periodically and help defeat her.
Before being cursed by the Darkest Faerie, he looked like this:
This will be the worst mistake of your life
Whoohoo! This pain was made for you and me!
Malum flicks his hand towards the ground. 'You will regret approaching me!'
Malum gains a Ring of the Lost by using Hubrids Odial Sphere!!!
Haha! Wow this wand really is great!
Malum gains a Fan of Swords by using Hubrids Odial Sphere!!!
You really should NOT be fighting me!
Wait! You've got the wrong guy...
During the plot, the brooch he wears, which he is unable to remove, was draining his life. It is unclear if this is still the case.