pawsplay said:
Spider-Man is all but outside what M&M allows unless you juke the PLs and put people on unequal footing.
There are so many possible ways of making Spider-man virtually unhittable that it is hardly even worth mentioning. Just like Champions M&M bases Powers off of special effects. But you can start with the basics:
Spider-man: PL 10 8 Toughness 12 Defense. That right there means that a roll of 22 is needed to hit Spider-man. Against all the Mooks Spider-man usually fights that generally means a natural 20 roll is needed to hit him - and no Critical Hit benefit is gained from that roll. Then, even after one of them hits Spidey, he still has a chance to "roll away" from the Damage with a Toughness Save. So an "unhittable" result is not just the fact that a Miss was rolled but also that a Toughness Save was made.
Now we add some Feats: Defensive Attack and 2 Ranks of Improved Defense. Defensive Attack allows Spidey to shift 5 points of Attack into Defense. Against Mooks and bruisers like Rhino, Lizard, etc, who are not difficult to hit, Spider-man does not need all of his Attack so raising his Defense to 27 is beneficial for him.
The two Ranks of Improved Defense allow Spidey to "dodge" for a value of 30. All those panels where you see Spider-man doing nothing but jumping out of the way of an attack are generally him dodging. And again, if hit you still have the fact that Spidey can "roll away" from the Damage with a Toughness Save.
Now we get into the creative parts. You can buy a Power like Displacement to represent that Spider-man's insessent hopping around during automatically gives you a 50% chance of being missed due to his acrobatics actions. You can buy Deflect to a Free or Reaction to represent the Spider Sense's ability to instantly give Spidey a chance to avoid Damage. And there are other things which can be purchased as well.
The things you build into a character are what give them the special abilities you see in the comics. If you do not give Spider-man the Skills, Feats, and Powers which make his agility shine then it will not.