This is a japanese smiley (kaomoji) keyboard.
You can use this keyboard in any app. Just add it via Settings-Keyboard-Add Keyboard and you're done!
This keyboard contains a big collection of different japanese smileys ordered by category. Just change keyboard in by pressing the globe and you can use this in any app
The categories are:
喜ぶ = Happy
笑う = Laugh
焦る = Sweat
泣く = Cry
怒る = Angry
動き = Move
戦う = Fight
突っ込む = Strike
照れる = Blush
Add the keyboard by going to Settings->General->Keyboards->Add keyboard
This keyboard does NOT record keystrokes or send data over the internet.
The "allow access" option is only needed when changing background.