Definitely Deadpool. Not that Spider-Man doesn't, just Deadpool virtually NEVER shuts up, even when mortally wounded.
The Torch still is sometimes, isn't he? He was in Waid's run, anyway. But he's more of a showboater than a wisecracker.
Iceman just got residual angst from being a mutant. Lord knows no mutants are allowed to have senses of humor anymore. See also: Beast.
To play Devil's Advocate, the X-Men's lives have been a steady train of misery and death for so long, it kind of limits someone's positive mood. How many X-Men have been killed? How many times have they peered into their futures, only to find death and the unquestioned triumph of all their enemies? They've watched Jean die, Cyclops become a trigger happy *****e, Wolverine all but abandon any attempt to reform his temper because it gets better results (which Cyke now encourages), Angel become Apocalypse Angst Personified, Polaris go insane, Havok be presumed dead for ages, Xavier to reveal one more wicked past detail after the next, and even their newest students have been slaughtered and maimed
en masse. Colossus was among the purest of them and he got to outlive his family, sister, and girlfriend, in that order. To have a sense of humor as an X-Man since the mid 90's is literally to be akin to the Joker, someone who laughs at death or torment.
Which is a problem. Endless angst has kept the X-Men recognizable, but has often reached overkill. That is half the tragedy of reading something like FIRST CLASS, knowing the X-Men will never be that pure or fun again, especially as characters. You couldn't, not with what they experience monthly. It also makes them daunting to write, I imagine. Colossus was in an endless funk in the 90's due to his sister and family dying, and now he is in an endless funk over Kitty. Who next to kill off, that flight attendant he briefly dated during the Claremont/Bryne era? Sadly, that has likely led to the cycle that has kept him from writers' attention for anything decent. Endless misery only writes itself for so long before becoming just as much of a predictable gag as talking gorillas, only more pretentious. The X-Men are the only franchise where someone named "The Sugar Man" is supposed to be treated with the utmost seriousness.
Slott fought hard to get Beast on MIGHTY AVENGERS, though. Maybe editorial may give at some point.