The real chaos here isn't the platform question, though that's real enough. It's that gamers have strong opinions about their peripherals, and 'I got this from Croma, thought of you' doesn't land when the person has already researched every mouse switch type for six months. The subtext of gifting a gamer is: do you take their hobby seriously, or do you see it as 'just games'? Get it wrong and the gift sits in the box.
The safest category is desk accessories and peripherals that improve comfort without requiring you to understand their exact setup. A large desk mat (the XL format suits every sensitivity setting), a wired gaming headset with good mic isolation, or a mechanical keyboard for someone still on a membrane board. These categories have wide rig compatibility and solve daily friction. The person gaming four to five hours a day notices a quality wrist rest within minutes. Anything that plugs in via USB and works immediately is your friend here. Your job ends at unboxing, not at device pairing.
Don't buy game titles. Not physical copies, not digital gift cards unless you know their exact platform and region. India has real region-lock issues that will turn your gift into a problem, not a gesture. Also skip any gaming chair under ₹8,000, where the build quality becomes the unintended message. Gaming-themed merchandise, mugs, posters, unless you know their actual in-game identity, is just decoration they'll be polite about and quietly shelve.