At the present time Radiation/Radiation Exposure has not been a big deal to most. There are a lot of Passive Attack Buffs that already resist or reduce radiation. However, there are a slew of characters in the Marvel Universe who derived their powers an exposure, or overexposure to radiation. Therefore they should either be immune or resistant to radiation.
The obvious resistant characters are the entire line of Hulk's (Hulk, She Hulk, and Red Hulk).
The Radiation Resilient group however could be a little more tricky. How far should the list go. The "original" Fantastic Four: Mr. Fantastic, Invisible Woman, Human Torch, Thing and yes Doctor Doom all got there powers from an overexposure to cosmic Radiation. Spider-Man was bitten by a "radioactive" spider.
Then there are those that absorb energy, but could be OP if given a resiliency to radiation. This list would include Bishop, tough you could include radiation in his Energy Manipulation. You might think Havok, but he already takes fifty percent less damage from radiation due to his Cosmic Absorption Passive Attack Buff.
There are a lot of Passive Attack Buffs that already resist or reduce radiation, but none for the aforementioned Hulk Group. Remember this just an idea/suggestion for certain characters. These are not actually buffs and the below Passive Attack Buffs below just describe what the could look like.
So, what do you think? Who else should have a resistance to radiation? Thoughts? Idea? Let's hear them below.