[quote=Dead Cruiser]
Name: Giovanni "Gio" Giorno
Age: 19
Appearance: 
Personality: Gio's mentor (and mother) Maria Giorno described him best: "A genius at cheating, who should not be released into human society under any circumstances." Gio is a far cry from his long and noble ancestry. Mouthy, arrogant, undisciplined and short-tempered, it takes the slightest provocation to get him to pick a fight with somebody. This problem is only compounded by his ruthless effectiveness in combat. His razor-sharp observational skills combined with his natural tactical talent give him an almost supernatural intuition. In addition, "playing fair" is something that Gio firmly believes is for suckers. If it means winning a battle, he will use every cheap trick at his disposal, and then some, using every possible means at his disposal to achieve victory. This resourcefulness makes him almost completely unpredictable to compete against, as one can never know what crazy scheme he has up his sleeve.
Abilities: An inheritor of the Life affinity, Gio mostly uses it though his family's signature technique, the "Overdrive." The basic idea of this technique is transmuting mana into life energy, which is then infused into another being, with varying degrees of control and power. This can have a wide array of effects on beings alive, dead or undead. Short, controlled bursts can repair damaged tissue or revitalize mostly dead cells. Greater bursts can "overload" the systems of living creatures and effectively paralyze them by de-synchronizing their minds and bodies. Extremely precise releases of energy can trigger the bio-magnetism or bio-electricity of most living things, and allow such feats as hypnosis, walking on water, or the climbing of sheer surfaces. The Overdrive is extremely lethal to undead creatures such as vampires or zombies, as it dissolves their necrotic flesh in much the same way as sunlight. The energy of the Overdrive courses through Gio at all times, giving him uncanny strength and resilience. While the Overdrive can be sent through inorganic material such as metal or stone, it only has any sort of noticeable effect on organic materials (which are also far more conductive to the Overdrive), so these substances are used as mediums for ranged attacks at best.
Weapons/Equipment: Gio usually carries bottles of Overdrive-conductive oil, several different fireworks, steel crackers, a Swiss army knife, and a pair of goggles. He also drives a motorcycle on occasion.
Brief Backstory: Born as the heir of a prestigious lineage of Italian vampire-hunting Magi, Gio spent most of his youth in Rome, flipping skirts, getting into fights, and generally causing trouble. He blew off his practice of the magical arts, as he possessed a natural talent for it, and was capable of using an unrefined Overdrive from a young age. His younger days were spent unconcerned with the struggle against the ancient vampire clans that threatened many societies. However, this changed with an organized attack on his family's compound by a small army of vampires and their servants. The were eventually repelled, but at the cost of the lives of most of his family. Gio decided to take from this that he must learn the true nature of his family's magic, so that he can continue their traditions, at the very least. After a few years of training with his mother, he was deemed to have a sufficient grasp of the Overdrive, he set out on a reconnaissance of the supernatural world, which led him to his association with the Fu Sonzai no Gensō detective agency.
[/quote]

Okay, um... neither the magic system nor vampires work like that. If you want to do something at all related to vampires you need to stick to how they work. The magic system is described in its basics as well.