How create animated emoticons for Hybrid App

I am developing a chat app (Hybrid app) for android and IOS. I intend to use some animated emoticons to add spice to chat.

I have 2 questions here:

1. How to create custom animated emoticons that I could integrate into my chat app and user could use to chat.

2. Will animated emoticons impact the app performance, especially if I attach sound to them?

Thanks alot!