Hi there,
Do follow steps prompted below.
1. You will need to modify this files
.../administrator/components/com_komento/includes/smileys/emoticons.json by adding those command/keywords for your new emojis. You can do template override them accordingly.
Template override path:
/templates/your_current_template/html/com_komento/emoticons/emoticons.json
2. Add those emojis images using command/keywords you apply on first steps, as for example, angry2.png
Template override path:
'templates/your_current_template/html/com_komento/emoticons/keyword.png'
3. Edit media/images/icons/emoji/icons-emoji.png to suite your news emojis(shown here
https://screencast.com/t/7J0ElvAXT)
Template override path:
'templates/your_current_template/html/com_komento/emoticons/keyword.png'
Please give it a try and see how it goes.