Name: Hasunada Heiaki (name first, surname second)
Age: Officially 56, off-the-record: 90
Sex: Male
Eye color: Blue
Hair color: Ordinarily grey, otherwise brown.
Background:
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Hasunada was born in September 12, 1920. He was an ordinary kid with a normal life (with the exception of being orphaned by his mother), until the Japanese decided to invade China. Against his father's wishes, the by then adolescent boy enlisted in the Imperial Army, entranced as he was by patriotic propaganda, in the year 1936.
It is no mystery that war can change a man. When it comes to those who have potential for spiritual awareness, this becomes doubly true. Hasunada spent the majority of his time in service on the front lines of the campaign to take Shanghai. Almost half a year was spent as the troops from both sides engaged in what was primarily urban hand-to-hand combat. As a result, Shanghai quickly became populated with the angry spirits of the deceased, a truly haunting scenario all its own - and the shock that came with the slow, mounting realization that he had blood on his hands combined with that gruesome setting to awaken his spiritual powers. Shortly after the definite fall of Shanghai, Hasunada was discharged and sent home, unable to fight anymore from what was essentially incredibly amped-up PTSD.
It was around this time that he first encountered a Hollow. Instinct took over when the body felt threatened. His spirit fought back when his heart had given up on living. Slowly, Hasunada began to realize the existence of the spiritual word and, for the most part, its intricacies. He also began to realize he wasn't the only one with special abilities. And as tends to happen, he organized his own little motley crew of spirit world do-gooders. Parallel to this second life, he also began to restructure his own, taking up Japanese at the University of Tokyo.
In an attempt to repent for his past as a soldier, Hasunada took up to exterminating Hollows with extreme prejudice. It was his own personal mission, his one great purpose in life.
As tends to happen with those who only see one thing, he became blind to all else. During a hunt for one particularly dangerous Hollow, his right eye was grievously injured. One of his companions died that day - the rest dispersed after the incident. The very same Hollow was eventually vanquished years later, but Hasunada's revenge was empty.
Since then, he is known by those in contact with the spirit world to have "retired" from active fighting, spending his days as a "common" Japanese teacher at Phoenix Town High School.

Personality:
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He's grumpy and grouchy. Has a nasty smoking habit, though no cough. Though he still hates Hollows with a passion, he leaves Soul Society to deal with most of them now. If he finds that other students have powers, he tries to quietly discourage them from going down a path similar to his, and denies any information they might ask for. If anyone who may be considered a threat to his students enters the school, he tends to call them aside for a nice chat, during which he makes it clear he doesn't like trouble. His students are the only thing he cherishes, and he will do everything he can to keep them safe. Not surprisingly, he's quite the loner.

Description:
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Typically, Hasunada can be seen wearing a simple black suit with matching trousers and tie, as well as black leather shoes, with a white shirt underneath. He wears an eyepatch over his right eye, and has a thick-ish mustache that's as grey as his hair. Though slightly receding, he is not bald. The only thing that deviates from his otherwise entirely normal business suit is what looks like a bandana tied around his left arm.

Powers:
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Hasunada has two basic powers. One of them is the ability to summon a suit of oversized "armor" made of concentrated Reiatsu. This suit can either be "worn" or float about freely within a certain radius of him, roughly one hundred and fifty meters in size (if any part of it exceeds this distance, it dissipates; the "suit" can break into separate pieces such as legs, gauntlets etc). However, the most distinctive feature of this power is that it's completely invisible to the naked eye. Each piece as well as the whole suit can be heard, felt, or smelled, but without a particularly acute ability to sense Reiatsu, it cannot be seen. It also retains transparency, however, so Hasunada cannot effectively turn invisible by "donning" it.
His second power is the ability to "steal" Reiatsu from his enemies for his own purposes by touching them either directly or through the suit. This Reiatsu can be used as "rocket fuel" to increase the speed of the suit, either by individual piece or as a whole, which enables something of a jetpack analog, or fired in blasts from the suit itself. As "fuel", it can be "burnt" either in bursts (allowing rapid, if brusque evasive maneuvers) or in sustained form. His ability to "steal" is limited by two factors, however:

1) Hasunada can only "steal" a fixed amount of Reiatsu at a time, proportional to the size of his opponent's Reiatsu. "Stealing" more requires prolonged contact. It also does not weaken the target noticeably until a certain amount of it is gone, at which point the target typically realizes the ruse. Said amount tends to vary by opponent.

2) Hasunada has a "maximum" capacity for Reiatsu. Once he reaches said capacity, he cannot "steal" more until some of it is used (at a minimum, the fixed rate he'd normally "steal" from an opponent). Thus, if an opponent is sufficiently stronger than him, he's unable to "steal" at all.

The overall strength of the suit is proportional to the amount of Reiatsu Hasunaga has in storage. At full strength, it could probably lift an empty school bus.

His powers also have a rather strange side effect. When first activated, Hasunaga's age visibly regresses. If by the time the suit is dissipated he has a certain amount of Reiatsu left, Hasunaga regresses FURTHER, roughly to fifteen years of age, and remains in that predicament for an amount of time proportional in hours to the amount of Reiatsu left. The upside is that while in this "age" his eye temporarily heals, including the scar it would normally have, so he becomes considerably less conspicuous. Usually, when this happens, he feels incredibly hungry.

While technically more of a strange property than a power itself, it bears mentioning. Hasunaga's body is unable to produce Reiatsu on its own. Instead, it needs to absorb ambient Reishi or convert the food and drink he consumes into Reiatsu. Despite the efficiency of the process, the "rate" remains such that he must consume great amounts of food and drink to mantain fighting shape. As a side-effect to this, Hasunaga needs no sleep. (He may feel tiredness and the need to rest, and can fall unconscious, but he needs no sleep.) His body "works" more like a spiritual body in this regard, despite being very much physical.

His more "mundane" skills include familiarity with firearms, expertise in close-quarters combat, and good observational skills despite the lack of depth perception. Despite having a passing familiarity with explosives, he prefers to avoid them.