Rick Rick can die, but if he does, everyone will have to start a new Rick Rick saga.
A big major rule is that you can't kill him off immediately, it has to be periodical. So, avoid doing something like this:
While Rick Rick was wandering in the forest, he fell into a 10-foot deep pit and broke his legs. He had no rope with him, and the walls were slick so he couldn't climb up. He had no food or water with him, and no one was around to help him.
Keep it tame, and don't make his misfortune grotesque. Also try to not make it super duper edgy. You can make it as silly and make something illogical happen too if you'd like.
(Optional) You can also mark if something good or bad happens to him.
Examples:
Rick Rick decided that today was a lovely day and decided to drive out to the local lake.