UPDATE-2: Updated completely this topic to include my 3 other creations.
Those MOC were build with pieces of "Uniter Pohatu, “Uniter Gali”, “Uniter Lewa” and other pieces from the first generation. So here I present you, five more uncommon toas.
Toa Jalai, she is a Toa of the Jungle. She can manipulate plants, and has the ability to control water, but cannot absorb and use it.
Toa Tilar is a Toa of Poison. First one ever created, let’s say, a failure, since his powers are pretty against the Toa codex. He can poison ennemies, and sometimes even turn them against their own allies.
Toa Ikero is a Toa of Plasma. He is the only known Toa of Plasma still alive(in my series). He got a special weapon, which redirects his elemental power to his weapon, creating a plasma beam(very tiring during a battle though). He was also member of the Order of Mata Nui, but seeing that his friend, Rilana, left, he left the Order to join the Rebellion.
Toa Rilana is a Toa of Lightning. She was first with the Order of Mata Nui, but realized how militarized this organization was. Her goal was to chase down Toa Theon, destroy the remaining dark hunters, etc, but she later joined the Rebellion because she felt that something was wrong with the Order.
Toa Theon is a Toa of Shadow AND Fire. Like Takanuva, he was attacked by a Shadow Leech, and could remove it before the entire transformation. Only this time, he was a matoran. He was hunted by the Order of Mata Nui because of his great elemental powers(exception Takanuva).
The Rebellion consists of 5 members now:
-Toa Jalai(leader)
-Toa Tilar(deputy leader)
-Toa Ikero
-Toa Rilana
-Toa Theon
They joined the Rebellion in that order.
Jalai and Tilar were considered as misconceptions, and, as matorans, had to flee. They transformed to Toa thanks to Lhikan, who ordered the main operators on the Red Star to give them a chance to be real hereos…
There isn’t a real background story for the 3 other Toa.
As you can see, they are a mixture of the G1 and G2 Bionicle building systems. I don’t know if they should have the ability to switch between the G1 and G2 universe, but they would need an Olmak mask for this.
I hope these guys look decent for a simple Toa MOC. Sadly, I had to use the Uniter Chest, and since you can see their respective element icon, it makes no sense to make them a Toa of Poison and Toa of Plants. Thank you @Nitro-Nynrah for your proposals!