Malar: patrons and werewolves

I’m running a one-shot homebrew that has to do with werewolves. One of my players decided to go with Pact of the Fiend Warlock and was wondering about my setting to decide what patron to go with. At the time, I told him to just make one up, but the more I thought about it, the more I thought it could have to do with the story and better connect his character to the story. So I did a little research and discovered Malar.

https://forgottenrealms.fandom.com/wiki/Malar

I’m still unfamiliar with DnD Lore, so I ask if this is a good idea for an Elf Warlock to be working for Malar in a setting where werewolves probably under his control are the main enemy? If not, who would you recommend?

I know nothing about Malar; I'm not even reading that wiki entry.

But in a one-shot, choice of patron should either be completely irrelevant, or extremely dramatically relevant. If the patron is whatshisface, you should be prepared to push it, making it clear that the warlock is working directly against their patron's interest. If you're at a decently high level, I'd say threats from the patron themself are appropriate, but that's probably higher than the characters are in a game about werewolves.

You should discuss it with the player to see if it fits his vision. If the patron in some way goes against the themes of the character, it might get awkward as hell.

I understand and see your point. As much as I’d love some big subplot with a demon removing the werewolves for a generation but bring them back worse than ever and not allow anyone to talk about the deal, it has to lead to something big. That’s not really something I can plan in a week.

i only brought it up because the player asked me and I wanted my players to feel as included as possible. I realize now that not only would this be too complicated, but it also means I should try to do something for everyone. Back when we did oneshots before under my normal DM this was almost never the case. Maybe with his help I could pull it off, but I want this to be a surprise for him since he rarely gets to play.

Anyway, thank you all for getting back to me so quickly. It allowed me to delete my one message to the player in question and should give me more tome to prepare what truly matters.

I’ve basically made my decision, but I’m open to any other feedback or even just for fun ways it could work in theory. Even if I do not use them, it’s fun to think about.