Empress of Serpents, Echidna is a character from the Puzzle and Dragon series.
Difference from Pre-evolution
Her hair have become somewhat shorter. Now, her shirt is gone and wears a red bra. Her tails changes from blue to red now. Also, her swords are now red to express her fire abilities. Her yellow ring that was on her shoulder is now replace by a red clothing. It is also noticeable that she haves several rings on her arm.