I'll be honest, I don't entirely grok Cavalier as its own class idea. If it's religious, it's hard for me to see any daylight between it and Paladin: holy warriors that have a special steed and fight in the name of an oath or commitment. 4e recognized this by making Cavalier a Paladin subclass. If it's nonreligious, it frankly sounds like (as 5e did it) a Fighter subclass, a warrior specializing in mounted combat without the aid of magic or anything supernatural.Are Paladin and Cavalier both lawful stupid zealots or only one of them?
You may note that almost all of these involve either refusing to engage with the other players, engaging with them in coercive or abusive ways, or being condescending and dismissive to the other players. That's sort of the core trifecta of Bad D&D Character Tropes: disengaged, demanding, or dismissive. If the player themself is being any of those three things, the character is basically automatically bad. In rare cases, it's possible to pull off the character being like this if the player makes clear their intent, but that's a difficult undertaking--usually the best way to pull it off is to make the above be a front, something to keep others at arms' length because of anxiety or self-doubt or genuinely believing that people shouldn't associate with them.
The only partial exceptions are the Bard, Monk, and Shaman. Monk and Shaman are both at risk of falling into racist stereotypes, and the whole "mystic wisdom" angle is often dismissive in its own right. The promiscuous Bard is basically dragging everyone else along for their sex fantasy, which fits fairly well into the "demanding" part just in an unusual way.
Answer: all of them. This isn't limited to just one class, or even just one group of classes.Question:
Which class is the one with the trope of being obsessed with collecting magic items? 50% of my D&D life has a "Magic Item! GIMME NOW!" PC but they range from fighters, wizards, and artificers. Christmas Tree Fighters or Wizards with 3d6 magic staffs/wands.
While I agree with the suggestion that it's all of them, the Rogue is arguably the one most associated with it, because one of the bad Rogue stereotypes is "steals everything that isn't nailed down, and many things that are," not because they have any utility, but just to have them.Which class is the one with the trope of being obsessed with collecting magic items? 50% of my D&D life has a "Magic Item! GIMME NOW!" PC but they range from fighters, wizards, and artificers. Christmas Tree Fighters or Wizards with 3d6 magic staffs/wands.
Mysterious stranger from the inscrutable east.
The first one is a classic. The second one is GREAT for a Paladin that is an antagonist in the Campaign.Paladin - every paladin ever pre 4-5e. Burn them.
All of them, because for a not-insignificant number of players finding magic items is the most fun part of dnd. And it is a fun part, at least (which is why I don't get no-magic-item games).Question:
Which class is the one with the trope of being obsessed with collecting magic items? 50% of my D&D life has a "Magic Item! GIMME NOW!" PC but they range from fighters, wizards, and artificers. Christmas Tree Fighters or Wizards with 3d6 magic staffs/wands.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.