Character design (stickers) for a mobile app

Esto es lo que Logkr Media, Inc. buscaba en su character design

Virtual sticker set with cute rabbit with a crown conveying birthday gesture such as holding a cake, present, big happy smile, star, etc. We need 25 stickers, must be vector ready .eps or .ai.
These sticker will be used for a app such like LINE and Facebook messenger stickers.
(Attached files are for reference only)

Additonal notes:
Looking for a style like this, simplistic is key in this, flat colors. We want a character that has personality. Here are some examples below. Please use a color background to show if its layer on top of a photo, must work with any background. So outline the drawing in black with white outer border. No shadows, no gradience. We want a flat simple look. We prefer a white rabbit.

https://d13yacurqjgara.cloudfront.net/users/10562/screenshots/794877/oswalddribble-01.jpg

https://d13yacurqjgara.cloudfront.net/users/93113/screenshots/691955/rabbit.png

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