My brother is 19 and literally all he does is sit glued to his PS5. I want to get him something for Christmas that's gaming-related but not another game, because he's already got tons of them. I'm thinking about accessories but I'm not sure what's actually useful.
A decent headset is the best thing you can give him because pretty much every online game needs one and it makes the experience way more immersive! If your brother already has one, then look into a charging dock for PS5 controllers (those things drain on their own and it's a pain constantly charging them), or if he's more into competitive gaming, an arcade stick or a racing wheel if he plays racing games. Another classic that always works is a huge mousepad in case he ever wants to play on PC, or even a phone stand like a PopSocket but specifically for gaming that people use a lot for watching streams while they play.
What works for me is giving gifts that improve comfort because people spend hours glued to that. A good lumbar pillow or a decent gaming chair makes a huge difference if he's going to be sitting all day, but heads up: make sure your brother doesn't already have one, because if you get ahead of yourself and he's already got a new chair, you'll drop a ton of money on something he doesn't need. Another cool option is cooling pads for the controller or a charging dock so it's always ready without having to hunt for cables, or even an ambient light for the setup that honestly looks great without being expensive. What I'd do is ask him in a casual way what bothers him or what's missing in his gaming area, that way you don't end up giving him something he's already got lying around.
Extra controllers like modular arcade sticks are what really worth getting because your brother can customize them depending on whatever game he's playing at the moment. My cousin had the same obsession with the PS5 and I got him some customizable buttons; ended up being something he uses every day because it lets him play more comfortably without having to keep buying new games.
Another option that works well is a stand or wall mount for the controllers, because if he spends that much time gaming he's probably tired of them constantly running out of battery; it keeps everything organized and visible on his desk.
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