Oh man... I knew I got myself into a controversy once I even attempted this one...
Roodaka... The Queen of the Visorak, and the most controversial female character of all BIONICLE. Complete with an evil laugh, a love for Makuta (LOVE IS CANON, DEAL WITH IT, GREG), and turning on the idiot Sidorak was (smashed by Keetongu)!
Roodaka was a Vortixx that came to fame after climbing a Xian-eating mountain, and eventually teamed with Sidorak to take over an "abandoned" Metru Nui.
Eventually, she freed Makuta by placing a crystal of his bond in her chestplate, freeing Teridax when Vakama fired a knock-out shot at Roodaka.
Overall, a standard femme fatale, Roodaka has caused controversy in the BIONICLE community ever since all the 6-12 year olds in 2005 became teens and began discussing the sexism of a toy centered at 12-year-old boys.