User blog comment:BobTheDoctor27/Contest of Champions/@comment-24323440-20150826091736/@comment-25396049-20150826104121

'this category asks entrants to take three fanon/canon Matoran and merge them together to form a larger, singular creation. Please note that all Matoran involved in the Kaita must be of different elements. The Matoran involved can be pre-existing or created entirely for the purpose of this contest.'

Yes, they have to be made up of 3 Toa/Matoran :)