Evangelion Unit Zero

Unit Zero is the machine piloted by Rei Ayanami. It has no mouth and can make no sound. For a long time, the unit had a head configured into a complicated sensor and testing array, rendering it nearly useless for combat. This forced it into a fire support role until after Asuka showed up in Unit 02.

Titanus Modules
Unit Zero, like the other Evas, eventually has Titanus Modules created for it by NNHIS.

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Other
Unit Zero is never named, one of the few Titans in the series to lack a name.