Who is Redd Heart from The Looking Glass Wars and what is their importance?

Redd Heart is the disgruntled sister of Queen Genevieve who was passed over for the throne. Redd is a strong imagination user and she has embraced Black Imagination over White Imagination. This gives Redd a strength and power that in the end Genevieve cannot fight. Redd takes over the throne and rules for thirteen years, turning the once happy, peaceful Wonderland into a world of unhappiness and injustice. Only Alyss is strong enough to fight Redd and for this reason Redd tries on multiple occasions to have Alyss killed.