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Tamaki Chieno used to be the vice-president of Root Academy's Student Council. She becomes the president after Souji’s resignation and winning the elections. In season 3, she is a 3rd Year student.
Tamaki has short brown hair and brown eyes. Her bangs are held by a yellow hair pin. She is usually seen wearing her school uniform.
- Her name is a pun on a type of mechanical puzzle named "ring of wisdom" (chie no wa). "Tamaki" is a synonym of "wa".