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According to Misato, Unit 05 and Unit 06 were originally planned to be more or less a continuation of the production model design used for Units 02-04. However, when Seele began construction of the mass production model Eva Units 05-13, these plans were scrapped. The unfinished original Units 05 and 06 were scrapped for spare parts used to repair Units 00 and 02 after their fight with the Angel Zeruel. Various different EVA units have originated in spin-off games and other various media.
In the Battle Orchestra game two new EVA units are introduced. EVA Unit-Alpha (甲号機, Kōgōki?) is a green colored EVA with distance-controlled gun barrels mounted on its shoulders (possibly inspired by the Psycommu System from the Gundam franchise), its pilot is unknown. EVA Unit-Beta (乙号機, Otsugōki?), piloted by Kaworu Nagisa, is gold in color with wings and a katana. EVA Unit 04 appears as well, painted a different shade of silver and piloted by Kensuke Aida.
Read more about this topic: Evangelion (mecha)