system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter/General RPG]How well would pure elemental combat mages fare in the wizarding world?

In the Rpgs. Magic never have a civilian use. All you have are combat spells and healing spells. So how well would Rpg mages fare?
gpt
They'd probably wreck shit, fur rill.

Seriously though they'd probably be either the best Aurors or incredibly destructive Dark Wizards. 

If you're talking like a mage who is some what proficient with all elements they'd be tough as hell to kill considering most RPG mages have shields/bubbles they can protect themselves with and they don't usually have to have wands and only a staff that boosts there power but isn't a strict necessity. 

Since their magic is indeed combat oriented they are already fast thinking and have a variety of spells to deal with other wizards of a similar nature let alone HP wizards where the majority of spells aren't directly combat related. And if they are in the same universe at that point it's likely they could also learn how to cast all the spells taught at Hogwarts and possibly without even a wand.

There are some powerful spells in HP but few come close to the pure destructive/offensive nature of those found in RPGs. Think of all the AoE spells where it's literally just fire/ice encompassing a large area around them.

If they couldn't learn spells like the HP wizards they might even be considered a separate "being" entirely. Sure they can't learn all the weird some what gimmicky spells and the more subtle useful ones but what they excel at they really do well.

So to answer your question more directly: They'd fare quite well, quite well indeed.