Fantastic Four

is a team of superheroes, led by Reed Richards.

Reed Richards/Mr. Fantastic
He is the leader of the Fantastic Four and the resident super-genius as well as the boyfriend of Susan Storm - despite his vast intelligence Reed suffers from a bit of autism and often gets himself and others in trouble with his experiments

Susan Storm/Invisible Woman
She is the more down-to-earth of the group and often acts a bit like a mother figure, keeping the others from causing too much trouble with their bickering and also trying to get Reed to stop being quite so "nerdy" and enjoy life a little. She is fiercely protective of her friends and views the Fantastic Four as her family, any villain foolish enough to provoke her quickly learns this fact - and Susan is no push over, being one of the most powerful members of the team.

Jonathan Storm/Human Torch
He is the younger brother of Susan Storm and a reckless, mischievous superhero who enjoys tormenting the Thing - although incredibly self-centred and a little egocentric Johnny is still heroic and will fight to the death to protect his friends and family, as well as what he views as his - much like Spider-Man, Johnny is prone to mocking villains, sometimes providing a rather useful distraction, of course he can also get himself (and others) in trouble due to this trait as well.

Ben Grimm/the Thing
was a friend of Reed Richards who was caught in the accident that created the Fantastic Four - while the others remained relatively human he was mutated into a rock-like monster and he is very sensitive about that fact - Reed has promised to find a cure for Ben but so far has been unsuccessful.