Esti is a 24 year old mecha bunny (or at least programmed with that mindset) living in the sonic world. Her "home" is in empire city (i.e. new york). She has the powers of a mecha bunny. She can use the common sonic techniques. She could participate in races (such as the crossworlds racing event)...though has not made the leap to do so. While she is a "mecha", she's not a creation of eggman (that much is certain).

Life wise, she's considering where she could work.

She gets news of other "duel monsters" in the world from time to time, granted she's not sure how.