Adventure Time started as an animated show, not a comic. The TV series gained popularity before any comic adaptations were made. The animation was the initial form of the story's presentation to the audience.
Adventure Time has been at Comic Con on certain occasions. Usually, it's part of the event when there's new content or special announcements related to the show.
The Adventure Time comic is canon. It adds depth and new perspectives to the existing storyline, while adhering to the fundamental framework and lore of the franchise.
One way to show time passing in a comic is through the progression of events. For example, if a character starts as a beginner and later becomes an expert, that shows time has passed. Another method is to have visual cues like faded or aged objects. You could also incorporate time stamps or calendars in the background.
The cast of Regular Show is a bunch of unique and hilarious characters. Each one has their own quirks and personality traits that make the show super fun to watch.