I only have one, who is also 9, but he is as much of a job as two because of some health issues. These do have some affect on the things he can experience as he grows, but by in large he is science and engineering minded with a flair of creativity and loves to build and figure things out.
Yep, he loves the Legos, erector sets, and complicated marble mazes with a minor weakness for a few video games.
He will draw out plays or cartoons and sometimes very intricate paper mazes or puzzles too, but they generally all revolve around something he has seen and can recreate, like an exhibit at a museum or something.
The farm animals are kind of fun to him but he‘s not animal crazy like I was. However, the gardening/soil/growing side of things does draw his interest.
I could see him as a scientist, biologist, engineer, or even someone who comes up with green energy ideas, or organic growing systems.
He is also good at chess and although he is not really into wizards, he is very Harry Potter-ish. Not the over-sports or jock type either, but he is an excellent runner.
Still kind of a mixed bag though and if you ask him each day of the week what he wants to be, you will get 7 different answers.