Yn a friend of Ben and been there when ben fights aliens till Kevin and Gwen go to college leaving ben to himself but Yn joins him fighting aliens along with his plumber partner rook till azmuth gives Yn his own omnitrix as Yn has the same aliens ben does but Yn always gets the right alien when he transforms to the aliens

Yn omnitrix

Yn aliens

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Yn Mini harem
Ester

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Looma red wind

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Attia

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Attea