The one who has everything
Defined by speed rather than by taste: they own it before you thought of it. So buy the thing nobody thinks of.
The person who has everything is not difficult because they are fussy. They are difficult because they are fast: whatever you thought of, they thought of it in March and it arrived on the Tuesday.
So the category to aim at is the one nobody buys for themselves, which is almost always organisation. Somebody who owns a great deal owns a drawer that has lost its argument, and a storage box that is actually the right size is the rare gift that changes a room rather than adding to it.
The same logic runs across a desk. The surface is full because the things on it have nowhere else to be, and an organiser is the sort of purchase that feels too boring to make and too obvious once made.
The other reliable seam is maintenance. A tool for the specific annoyance they mention every few months and never act on. A cable that finally matches the thing they keep borrowing one for.
Below, mostly small and mostly dull. Dull is the point: they already own the exciting things.
What to get them

Super Mario Bros Advent kalender - 24 verassingen - Kerst - Nintendo - Videogame Merchandise
€49.99
Xtorm Portable Power Station 500W
€261.37
Chillafish Kinderstep jongen en meisje vanaf 5 jaar met voetrem - Oranje Roze - Step met verstelbaar stuur - Opvouwbaar en lichtgewicht met ABEC-5 wielen - Model Flexxi
€52.49
Xtorm Power Bank 20000 mAh 30W Bleu câble USB-C intégré USB-A/USB-C 2 ports
€44.04
Brabantia Dish Drying Rack Light or Dark Grey Kitchen Drainers
€63.47
Kipling INIKO Rugzak - True Black
€69.89
Gift Coves
- The one who builds
For the one who has a shelf of finished sets, and a table with one in progress.
- The one who makes things
For the one whose kitchen table is under a project, and the project is going well.
- The student
For the one who moved out this month and is still finding out what is missing.
- The one who automates the house
For the one whose lights come on before they do.
- The new parents
For the ones who have been awake at three in the morning lately, and hold it against nobody.
- The one on the bike
For the one who cycles to work, and then keeps going at the weekend.