Kaita

A Kaita is a fusion of three beings into one single being.

Toa Kaita
A Toa Kaita is a fusion of three Toa. Once the beings fuse, they turn into a completely different Toa with another personality, mask, and weapons.

A Hordika can't form one since they lack the mental focus to stay together.

The first ones formed were Akamai and Wairuha, the Toa Mata Kaita.

Matoran Kaita
A Matoran Kaita is formed when three Matoran fuse. As long as they have seperate elements, they can be formed.

None have appeared in the storyline.

Turaga Kaita
A Turaga Kaita is a fused form of any Turaga of different elements. Unlike the other Kaita, a Turaga Kaita required four Turaga to form.

None have appeared in the storyline.