To add an emoji

Apple has no say in what Emojis are available. That is up to the Unicode Consortium.

You can suggest new Emojis here: http://unicode.org/emoji/proposals.html

A Mango emoji will be coming with the iOS 12.1 update.

Apple brings more than 70 new emoji to iPhone with iOS 12.1 - Apple

You can let your wishes be known at: http://www.unicode.org/emoji/selection.html

The mango has already been approved, and the flamingo is a candidate for the next Unicode release; it won't be out before summer 2019.

(165072)

This is Apple Support Community, we are people just like you, not Apple.

that pink flamingo that you want might be in the next update.

https://emojipedia.org/flamingo/