Ultraman Nexus

About

Ultraman Nexus is Ultraman Noa's second devolved form, and is the form a Dunamist assumes after using the Evoltruster. Starring in Ultraman Nexus, his story represented as the final phase of Ultra N Project. After evolving from Ultraman the Next, Nexus would resurface in 2008 to fight against a wave of Space Beast assaults, slowly growing in strength after bonding with multiple Dunamists and finally regaining his long lost form Ultraman Noa in his battle with Dark Zagi.

Although Noa is his true identity, he made most of his future appearances as Nexus in subsequent entries of the Ultraman Series, indicating that he is able to switch between his true form and this form at will.

(Source: Ultraman Wiki)