He would hate to show his stims to anyone.
But these are a few he would do:
Hand flapping
Pacing
Foot tapping
Snaping
Rocking
Pen clicking/Tapping--------------------------------------
I can imagine him getting excited and he would want to stim but he would be around others so he couldnt. He would start shaking untill he had to step out and do a quick stim from what i said above for about a minute or two before going back inside while pretending nothing happend.
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He would have small fidget toys too.
Stim toys:
Rubix cube
Pen's
Fidget cube
Flippy chain
Infinity cubeHe also wear a special black ring that has a chain inside that can twist.(in pic above).
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I want that ring 😔