The foldable phone person has done 47 hours of research before buying their device. They've watched teardowns, read Reddit threads, and have opinions about display crease depth that most people form about property investments. Gifting them something tech-adjacent puts you in a bind: too generic and they'll clock that you didn't actually know them, too niche and you'll still get it wrong. This is someone who will notice if you gift them a 15W charger when their phone supports 30W.
Start with charging infrastructure. A fast wireless charging pad is genuinely useful because foldable owners tend to baby their cables, and the hinge area is precious real estate in their head. Next, a carry case built specifically for the form factor matters more than it sounds, because these phones scratch in ways a flat device doesn't, and the owner already has a mental spreadsheet about this. TWS earbuds with ANC are a solid third option because this person is consuming audio content constantly and won't refuse a second pair if the specs hold up. Practical, not flashy. That's the right register here.
Do not buy a generic phone stand or mount. It won't fit the folded form, and they'll have to explain to you why, which is uncomfortable for everyone involved. Similarly, skip the power bank unless you've verified output wattage. A 10,000mAh bank gifted to someone with a fast-charge foldable reads as "I thought about it for three minutes." The trap is that it looks thoughtful from the outside, but the spec gap says otherwise.