Wario for sure. He is by far the best doubles character out of that list; he's generally considered the 2nd best doubles character in Brawl (outside MK), arguably first best. He's got almost everything a doubles character needs
- Lives long (he's very heavy)
- Kills early (fart, fsmash, ftilt, uair and bair are all great kill moves)
- Can follow up off teammate's moves very well (uair does 17, fart is big and kills, bair is also good here, fsmash does lots of damage)
- Can set up very well for the opponent to follow up (dthrow is so good for this that double Wario can NAKAT + False often convert a grab into a kill with their double wario team, fthrow also pretty good, fair is a good move for providing a weak hit that deals enough stun for your teammate to follow up)
- Hard to gimp (doesn't need to be saved by teammate) because of good recovery
- Can save teammate because of good recovery
- Extremely mobile; covers the air very well and can cover angles most characters can't, so he can very well complement his teammate's pressure.
- Bite is great for complementing teammate`s pressure; teammate forces opponents to shield, Bite beats shield.
And to give you a different perspective, Wario's 2 main weaknesses in singles are not as relevant in doubles. These being
- His air release weakness; most characters can grab Wario, not throw him, and when he air releases they get a super easy guaranteed followup. DDD can usmash/utilt/bair, Marth can do any aerial or kill with usmash/utilt/tipper fsmash, Snake gets bair/uair/utilt/nair, ZSS can do 17% with fair or go for a bair/uair/nair, etc. In doubles, this is not as relevant because the Wario can just opt to not mash out of the grab, making the air release take longer and thus the Wario's teammate can just come and interrupt the grab.
- His lack of range; despite his great mobility, his lack of disjoints means characters with big and/or long lasting attacks can keep him out. MK's/Marth's sword attacks (particularly fair/uair), DDD's bair and pivot grab, etc. In doubles, this is not as relevant because he's got a teammate to help him break through pressure and/or hit the opponent for knocking Wario away.
I strongly recommend that you watch videos of NAKAT + False, to give you an idea of what Wario can do in doubles. They're one of the only teams to have beaten ADHD + Nairo, who, as a team, had gone almost 2 years without dropping a doubles tournament.