Toa of Gravity

A Toa of Gravity was killed by the Dark Hunter Lariska while on one of her missions. She said she practiced using Gravity Kanoka Disks to get used to the Gravity, thus giving her experience on how to deal with the Toa. He was mentioned in BIONICLE Adventures 10: Time Trap. There are presumably more Toa Of Gravity that are not currently known.

Trivia
The Toa Of Gravity was the first Toa to have a different element besides the original six (not counting Light, Shadow and Time).