An easy-going, kind, and normally jovial man, Max often comes across as pleasantly absent-minded at times, but is actually quite perceptive. For instance, he knew early on in Ben's adventures who was most likely pursuing him.

Max is a very brave man, having dedicated his life to preserve peace on Earth between humans and extraterrestrial life. He regularly focuses on saving the lives of citizens caught up in Ben's fights with villains, and did so even while maintaining his secret life as a Plumber and not having access to Plumber weapons. His bravery has resulted in him being injured; having his DNA spliced; nearly killed in several dozen ways; and more.