I've wanted to create a toa kaita so when i finally found the original toa nuva sets i decided to create the toa nuve kaita. But the difference between the regular ones story wise is that they have become permanently fused together via a secret attack by a makuta. Luckily they were able to overcome the difficulties of being fused together and eventually they developed their own personalities. Also Wairuha Nuva wields a mace like weapon and a rotating shield and has added armor to himself whereas Akamai Nuva did not change much about his form. they currently work for the order of mata-nui in their respective reality.