 If you liked
Kurogane no Linebarrels
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 ...then you might like
Bounen no Xamdou
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in linebarrels the main char gets hit by a giant mech which gives him powers n the ability to control it, while in xam'd the main char is involved in a explosion where a light goes into his arm n he transforms into a xam'd...both of them have some similarities as you get deeper into each...both of them are considered no longer human