Some messaging applications allow you to add shortcuts for contacts to the home screen, and now Snapchat has added a variation of that feature. Snapchat 10.4 beta allows users to create home screen widgets for their friends, but only if they have a Bitmoji.
[Update: Out of beta] Snapchat 10.4 beta lets you add friends to the home screen, if they have a Bitmoji was written by the awesome team at Android Police.