Interesting, I think Rogue would be the best considering the variety of builds and subclasses available. I think Cleric and Bard would be the next two.
I am also surprised that Paladin is as high as it is. I think I would put Paladin dead last.
Here is who I would want:
1: hexblood arcane trickster (AT for shield/absorb elements), tavern brawler, grappler, medium armor, fighter adept (unarmed fighting). 18str/14con/14Dex (level 12) half-plate, expertise in athletics, acrobatics, perception, stealth, green flame blade, lots of oil. Turn 1 hex and GFB attack (hopefully SA). round 2 hit with oil vial (improvosed weapon) and bonus action grapple. Round 3+ GFB with advantage (burning oil in process). Alternate option is shadowblade when not using oil. Also have a mage hand to put oil on other enemies as a BA while one enemy is grappled. Expertise in stealth largely counters disadvantage due to armor.
2. Human arcane trickster: fey touched, shadow touched, magic adept (guidance, healing word, spare the dying), ASI-intelligence 20 int/16 dex (level 12). This guy actually makes crown of madness usefull by casting it on the guy player #1 has grappled. Best part is he can't break the grapple because he uses his action to attack one of his allies every turn. uses missiles or a rapier/BB when not spell casting. expertise Arcana, Investigation, perception, history.
3. Wood Elf scout: sharpshooter, ASI, elven accuracy, piercer. Expertise stealth, perception, insight, animal handling, nature, survival. This is a ranged attacker who is also your scout and your guide. 20 dex at level 8. You want sharpshooter for the bonus to range and ignoring cover
4. human swashbuckler: actor, ASI, ASI, shadow touched (disguise self), magic adept (presti, BB, detect magic). 18dex/20ch level 12. expertise in deception, persuasion, intimidation, SOH
5. Mountain Dwarf phantom: ASI ASI ASI ASI d20/W18/I16/ch12 level 12, expertise in religion, medicine, thieves tools, perception.
In a high magic campaign I might go with a thief instead of a phantom as #5.