Ienzo

Ienzo was one of the six apprentices to Ansem the Wise, and the complete being of Zexion. He appears in Kingdom Hearts Birth by Sleep.

Kingdom Hearts Birth by Sleep
Ienzo appears in Kingdom Hearts Birth by Sleep as a minor character, not speaking any lines. He is seen in Radiant Garden surrounded by Unversed, when Ventus appears and defeats the Unversed. Even comes forward, thanking Ven and tells him how Ienzo's parents are dead and that Ansem the Wise adopted him. Even gives his thanks once again before departing, with Ienzo giving Ven a glance before following Even.

He is also seen in the secret ending, walking with Ansem and eating Sea-Salt Ice Cream. They walk in silence until Ienzo stops and looks at Braig and Xehanort, bringing them to the attention of Ansem.

Dabbling in darkness
About a decade prior to Kingdom Hearts, Ienzo was one of six apprentices to the ruler and scientist of Radiant Garden, Ansem the Wise, alongside Xehanort, Braig, Dilan, Even, and Aeleus. Worried the Darkness in people's hearts would eventually consume his world, Ansem began performing tests on Xehanort's heart. Eventually, at Ienzo's persuasion, he created a laboratory in his castle's basement for such experimentation. However, Ienzo and the other apprentices had their own intentions for the laboratory, and began conducting inhumane experiments on the human heart and the darkness within it. Such experimentation led to the creation of the Heartless. Ansem quickly discovered their secret experiments, and immediately ordered them to stop. One day, after being advised to review their research data by King Mickey, Ansem found that the effects of their experiments had become irreversible.

Eventually, Ienzo and the other five apprentices dabbled too deeply into darkness through their continued experiments. Ienzo, along with the others, was consumed by the darkness, producing a Heartless. However, the apprentices all had strong wills, and so Ienzo also became his Nobody, Zexion. The six Nobodies formed Organization XIII, and banished Ansem the Wise to the Realm of Nothingness.

Appearance
Like Even, Ienzo has a scientist-like appearance, wearing the same white coat that Even wears over a black, V-neck top. Oddly, Ienzo appears to be much younger than his Nobody, Zexion, perhaps even younger than Ventus. Otherwise, he completely resembles his Nobody, Zexion, with a few minor changes such as shorter, lighter hair. His eyes also appear to be a lighter shade of blue. Likely due to his size, Ienzo folds the sleeves of his lab coat back, and even then his hands are partially covered. He also wears blue pants and black shoes, as opposed to the other apprentices' black boots.

Notes and References
Ienzo