Possible the best emoji keyboard. It's free.
Includes New iOS9.1 & 8.3 Emojis.

This app gives you extra keyboards with handy using emojis, symbols and characters in iMessage, Facebook, Twitter, Whatsapp, Instagram and so on.Also it provide lots of funny emoticons pictures and art text.
- Fantastic emoticon pictures
- Hundreds of Emoji art you can choose from.
- Easily create your own Emoji art with our canvas feature.
- Manage your favorites list to ensure easy access to your favorite Emoji art.

Also this app provide extra symbol keyboard, It contains:
- over 1000+ unicode symbols(like Math, Greek Alphabet, - Digits,Arrows, Stars etc)
- 7 different symbol category
- Custom keyboard with funny symbols