We know very little about Maw. He only appeared in this arc, his personality is never fully fleshed out, his “black hole mouth” is both unusual and horrifying, and he’s like the most enigmatic of all the Egg Bosses.
What we do know is that he’s a bit like Geoffrey St. John in terms of aesthetics and his classified “secret agent getup”, he is literally obsessed with perfection and that the Eggman Empire taking over is what’s best for the world, and his true, sombre motivation is to extend his own life. The latter could be because Thylacines are extinct in real life, thus hinting that his self-serving motivation might be more tragic than we thought.
His “big succ” attack is the most interesting thing about his character. Does he absorb the properties of the robots he inhales? Do they vanish from existence? Does he murder the little Mobinis inside the Badniks as he does so? The way he says it and Nephthys‘ shocked reaction seems to indicate the latter (in a “Never Say “Die”” fashion like in most children’s comic books). Personally, I like to think he just transports anything he sucks up to his Egg Army base for experimentation or Roboticization. Even the comic won’t get that dark, right?
We probably would have gotten to know the character more in the planned Archie version of the “Metal Virus” arc, considering this dude being in the epicentre of the experimental Roboticizer? I can see it now, Maw just revelling in “living forever” while he slowly turns into a Zombot. xD