The BIONICLE storyline features many Characters with varying personalities, traits, and places of residence.
The brothers who created Masks of Power for the Okotans.
- Ekimu - A Mask Maker whose masks were favored by the Okotans.
- Makuta - A jealous Mask Maker who created the Mask of Ultimate Power to usurp Ekimu.
The immortal creatures that embody the Elements of Okoto.
- Agil - The Creature of Light.
- Akida - The Creature of Water.
- Ikir - The Creature of Fire.
- Ketar - The Creature of Stone.
- Melum - The Creature of Ice.
- Terak - The Creature of Earth.
- Uxar - The Creature of Jungle.
The leaders of the six tribes through the generations.
- Former Protectors
- Current Protectors
The primary inhabitants of Okoto and its various regions.
- Ako - A young boy living in the Region of Stone.
- Bingzak - A young boy living in the Region of Stone.
- Harvali - An archaeologist from the Region of Jungle.
- Melea - A woman living in the Region of Stone.
- Oda - A young boy living in the Region of Stone.
- Umarak - The Shadow Hunter, born from the shadows to hunt the Elemental Creatures.
A race of pirates from a distant land who attempted to conquer Okoto.
- Axato - The tribal commander of the Skull Raiders.
- Kulta - The leader of the Skull Raiders.
- Skull Basher - A lieutenant of the Skull Raiders.
A group of monsters assembled by Kulta to carry out Makuta's plan.
- Lord of Skull Spiders - The commander of the Skull Spiders.
- Skull Scorpios - Large scorpion-like creatures created by Kulta.
- Skull Slicer - A former gladiator in the Arena.
- Skull Spiders - Spider-like creatures led by the Lord of Skull Spiders.
- Skull Warriors - Skeleton warriors created by Kulta.
- Gali - The Toa of Water.
- Kopaka - The Toa of Ice.
- Lewa - The Toa of Jungle.
- Onua - The Toa of Earth.
- Pohatu - The Toa of Stone.
- Tahu - The Toa of Fire.
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