The Greeeds are Kamen Rider OOO's main villain group. And it is recently confirmed that they will each have a human form.
Each Greeed represents a sub group of Kamen Rider OOO medals that could help him attain a "full-colored" form, like "full-green (GataKiriBa)" which represents insects. Many more to be revealed throughout the show.
- Uva - Insect Greeed (stag/mantis/grasshopper)
The most hot-headed of the Greed, and has the power to control wind and air. He is voiced and played by Yamada Yusuke.
- Cazari - Large Cat/Field Greeed (lion/tiger/cheetah)
He has a childish personality and moves at fast speeds, and able to manipulate electricity. He is voiced and played by Hashimoto Taito.
- Gameru - Heavy Animal/Weight Greeed (rhino/gorilla/elephant)
He has brute strength and can control the earth. He is voiced and played by Matsumoto Hiroyuki.
- Mezuru - Aquatic Greeed (killer whale/octopus/electric eel)
She can create and control water. She is voiced by Yukana and played by Honoka Miki.
Greeeds are considered as incomplete monster creatures since all of them have missing Core Medals in order to become complete. These medals are either scattered and sealed in various unknown places or some of it are already obtained by Eiji Hino to be able to become Kamen Rider OOO.
NOTE: We first knew that グリード, read as Gurido, is romanized as Greed, but it was later changed to Greeed for better accuracy.
Source: alternate-zer0 via JEFusion