Rick and Morty has proven itself to be one of the most significant animated series in history, populated with an infinite number of zany and unique characters. Even the title characters come in an endless variety, and some are more interesting than others. There are so many different kinds of Ricks, they've banded together to create an interdimensional government consisting of only themselves, but there is one Rick who stands unique amongst them.
But this isn't about Rick C-137, the self proclaimed "Rickest-Rick" of them all. No, there's another Rick out there that might be the smartest Rick of them all, and he's known to fans as Doofus Rick. He only appears for a few minutes in the episode "Close Rick-Counters of the Rick Kind," but his brief storyline has inspired a few Rick and Morty fan theories that actually make a lot of sense. Doofus Rick is incredibly smart, and this Doofus Rick fan theory aims to prove it once and for all.
A major part of nearly every Rick's personality is a massive superiority complex, and a total disrespect for the feelings and emotions of everyone else in the multiverse. He does what he wants, even if it means hurting the people closest to him. Doofus Rick is the exact opposite. He's a man who understands the emotions of others and can feel empathy, even towards a pathetic Jerry.
When Jerry enthusiastically shows him his collection of R2-D2 quarters, Doofus Rick holds back his own judgment and tells Jerry that their value comes from Jerry's love for them. This brings Jerry to tears, and it's an act of empathy no other Rick is capable of.
The first thing most Ricks mention when talking about Doofus Rick is that he eats his own poop. It's a big joke on the Citadel that he comes from a dimension where everyone eats their own poop, but Doofus Rick denies it every time. He even breaks down and cries at one point when two Ricks try to convince Jerry that Doofus Rick is a poop-eater.
But Justin Roiland himself said on the DVD commentary that Doofus Rick doesn't actually eat poop. The joke is just meant to show that the other Ricks have no respect for him, not that he's a coprophile. The creators of the show also admit they probably shouldn't have shown him inventing ovenless brownies in the same episode, because it falsely reinforced the idea he eats his own poop.
Doofus Rick and his Morty, who looks like Eric Stoltz from the movie Mask, appear to get along pretty well. This is, of course, a stark contrast to Rick C-137 and his Morty, who constantly squabble. In fact, pretty much every Rick treats their Morty like a used condom, and they can't seem to form a genuine friendship if their lives depended on it.
Then we have Doofus Rick, a man who can connect with a "regular" person without a problem. Jerry's first reaction to meeting Doofus Rick is guarded apprehension and distrust, but Rick manages to tear down those walls within seconds, with a few well-placed questions about his career. By the end of the episode, Jerry is basically in love with Doofus Rick. His ability to make genuine friends and allies out of perceived enemies makes him just as competent as the best Ricks, who often can't even be friendly to themselves.
Transdimensional teleportation is tricky, and Rick is the only person in the multiverse who's invent a portable portal gun. The galactic government goes through major hoops to try to steal this technology from Rick, but all attempts have meant with abject failure. There is no easy way to dimension hop without a portal gun, except for one invention that only appears in the Rick and Morty comics.
In issue #23 of the series, Jerry gets stuck in Doofus Rick's home dimension without a portal gun. Doofus Rick manages to improvise a "portal juice" that allows Jerry to return to his own dimension, without the need of a portal gun. Doofus Rick mentions is near impossible to travel interdimensionally without a portal gun, but he specifically has invented a way to do so. He's invented an extremely high-level technology all on his own, one that most Ricks wouldn't even think of.