Haha~ Your brother should be quite good at dressing up~ If so~ Wear a personalized pendant or necklace (I think giving a magnetic health necklace to a child of this age will make him proud, hehe) or a tag (tungsten steel personalized tags, military tags, very suitable for boys to wear) and engrave his name on it, he should like it very much.
Give him a men's bracelet. I think many boys, especially boys of his age, should like it.
Boys like to play ball. You can give him a basketball or a football~
Ask him for a photo and order a men's doll for him. This gift is very creative. And it is directly in your own appearance. Everyone who receives the gift will like it, and your brother is no exception.
Give him a DIY painted sun jar. It has a photosensitive element sensor inside. It receives sunlight during the day and automatically glows when night falls. The pattern on the outside can be drawn by yourself or customized