A comic where there aren't any jokes, it's just a character being nice to another character who is in emotional pain. There is no punchline. The final panel instead says something along the lines of "It's all going to be ok".
Variations include:
-A character talking about their lack of confidence in something not to another character, but to the reader.
-A character getting the courage to go off and accomplish things today.
-A character growing tired while drawing at a cintiq and then getting a second wind.
-A character waxing nostalgic about their childhood, then comparing it to their life now, then seeing kids doing a modern day version of what they were doing as a kid, and coming to the conclusion that things will be ok.
Friend: "Why does this comic about some sad mouse being comforted by another mouse have so many likes on insta?"
You: "Because people like your aunt will always be suckers for comfort porn."