Eve is the older brother of Sammy. and, along with Sammy, Is a pâtissier making pastries (cakes, cookies, etc.). always seems with his twin brother, both chipmunks love to make sweets.
In the Anime
Eve and Sammy befriended Sophia when he and his friends are transported to the human world. Everyone excepted Sophia thought there were dolls, and were kept hidden until revealed (mostly by accident). They assist Sophia with teaching her how to bake because she doesn't know how. His catchphrase is "We'll surely succeed" (きっとうまくいくよ Kitto umaku iku yo?).
Popular Misconceptions
Though feminine in appearance, Eve is actually a boy. Very commonly do people mistake this little chipmunk for a girl. but, he evidenced in his character page, Eve is confirmed to be a boy!