Captain-Commander of the Gotei 13

Name: Hayashi Daisuke (family name, given name)
Reiatsu: When sealed and in Shikai, it is orange.
However, when in Bankai, it shifts to Dark Orange, with a fair amount of Dark Red thrown in.
Personality: Captain Hayashi Daisuke is a fair leader of the Gotei 13, making sure to not aggrivate his subordinates, although he has an… active sense of humor, for example making joke versions of Captain Satoshi's plans and then publicly posting them. He will try to find out as much as he can about his subordinates, in order to understand them. He does have a… flair for the dramatic, somthing which annoys Captain Sigmund no end. He also almost never uses titles unless he's about to say somthing serious.
His major pastimes are playing music and reading.
If anyone tries to hurt those under his command, he drops the slightly goofy guy act, and will utterly destroy those who were foolish enough to provoke him.
Zanpakuto
Sealed form: Shinken used to be a large katana, kind of like the sealed form of Zangetsu. However, after it was shattered in a battle with Takeshi, it has reformed as a normal katana.
Shikai
"Yami ni Hikari wo Motte Koi, Shinken" (Bring light to the darkness, Divine Sword) The blade starts to glow, and he gains access to three special attacks
Shinya (Divine Arrow): The glow from Shinken extends much like an arrow made entirely of light
Shinbakufuu (Divine Blast): The glow from Shinken forms into a blast of energy
Shinbikari (Divine Light): The glow increases to a level of brightness that blinds anyone but Daisuke who looks at the blade
Bankai
"Moetatsu Hikari" The glow form the blade starts to behave almost like fire, and in fact the blade burns anyone cut by it. The glow also forms a pair of wings from his back. All three of the attacks acsessable in Shikai are still available, and become stronger.
Daisuke also has one additional attack in Bankai, that can only be used during the day.
Kowasu Hizashi (Destroying Rays of the Sun): This attack causes a massive beam of energy to shoot down from the sun. This goes through all weather, darkness effects, or roofs. The power from this… well, let's just say it creates an explosion that is taller than Sokyoku hill and leave it at that, shall we?
There is also engraving on Moetatsu Hikari. This is not visible past the intensity of the glow, but as time continues, the engraving starts to slow with a silvery light. As this happens, Daisuke becomes even more powerful. The reason for this is that using Bankai actually sends Moetatsu Hikari into a beserk rage, that gets stronger as time goes by.
The reason that Shinken is so large actually rests in Moetatsu Hikari. You see, most Bankai are large, and so require a large amount of energy to keep maintained, that being its only weakness. Moetatsu Hikari, however, gets no larger than normal, meaning that the massive amounts of reiatsu are concentrated in the (relatively) small area. This could start hurting Daisuke if the glow didn't start behaving like fire, and the large size of the blade allows the reiatsu to be dissapated. In fact, when he dons his Vizard mask, even this isn't enough, and the glow forms a pair of wings out of Daisuke's back.
In both shikai and bankai he can cause the blade to shatter, and then unleash a much more powerful version of any of his attacks (normally using Shinya).
Spirit: Shinken manifests as a young woman, who is dressed in a colour-swapped version of the shinigami uniform (white where there was black, and vice-versa).
Vizard Abilities
Daisuke has a Vizard mask, which when he dons it, vastly increases his power. He has Hierro, the ability to use Sonido and the ability to use Garganta even when he does not have it on. When it is on, he can also use Cero (including Gran Rey Cero), Bala, and he is significantly stronger. This form can be maintained indefinitely.
He also has an Evolved Hollow form, in which he has the ability to use Cero Obscuras (although it manifests more like the Black Getsuga Tenshou, including the ability to hold it whithin Shinken for added hitting power), and his reiatsu can easily drown opponents. However, this is difficult to control due to the vast amounts of power involved. This form can only be maintained for 5 minutes.
Daisuke's Inner Hollow has actually mellowed over the years, and Daisuke does not need to struggle for control.
He also can pull off level 99 kido without incantation.