Jalapeno is Doom-shroom's best friend, because they all can explode, perhaps. He is a plant that is easily made angry. If he becomes angry, he blows up and causes fiery terror. He can be happy but that is very rare. He may end up exploding a lot but he is more friendly than you think.

He got a 10 (or an A in a lot of countries) in Issue 4, then Peashooter crashed into it, and destroyed it accidentally, so Jalapeno blows up again. Also, in Issue 3,when he is standing in the lunch line, Scaredy- shroom accidentally bumps into him. This makes him angry so he explodes the whole line of plants (what's the point??? It's only a little bump). He makes a cameo appearence in Issue 17.