The Easter Bunny is a character. He has beautiful white fur and a pretty pink bow. You can look like him using the consumable costume. He appears in two artworks: a badge and a picture in Fishing 2015, which is also found in Charlotte's house. He is most likely the one who leaves eggs during the Easter events.
In the Easter 2013 event, when the event map came around, you became the Easter bunny instead of the shaman. With gameplay just like a typical shaman "thief" map, the Easter bunny had to avoid players for as long as possible!