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This is a bit of a side point, but something I wanted to discuss regardless.
The infamous "goofy Tobi". I'm sure we've all had a few laughs when watching this guy fool around.
Let's dismiss speculation for now, and assume that this is Obito acting like this of his own free will. Using the same analysis in the previous section, this is what can be determined:
Externally, for other people, this fooled other Akatsuki members so as to not discover his true identity, somehow. They assumed he was just a goofball.
However, what did doing all this mean for Obito?
Well, there's a possibility that he acted like this to
live out a life he wouldn't ever have anymore.
Obito was always more of a carefree-type as a kid, not really a prankster or a joker. Sure, he had a sense of humor, but his antics weren't ever this extreme. So, in a way, "Tobi" could be a sort of psychological aid for Obito, and he jokes around to make up for the fact that he'll never be able to act like a child again in the real world, as the moment he became "Madara", he abandoned himself.