Mr.4D

Mr. 4D is a character in Mario and Luigi: Laugh Lacking. He always appears after Mr. L leaves. He gets near Luigi, but runs away from Mario. He appears to be old, but is spying. He is as young as 10. He wears a disguise to make him look old. This Mr.L imposter gets scared of enemies, and can be caught in a couple of cutscenes in Super Luigi Odyssey 3. He acts strange around Mario, but does not do this near RPG Mario. He tends to have headaches time to time, because he watches to much YouTube.