A young person of questionable socio-economic background who wears sports clothes and baseball caps and lists main hobbies as harassment and aquiring gold jewellry

the thing that you don’t have when you’re phones percentage is over 20

Dodgy. Suspect. Someone acting weird and you're not sure why, so you use the word Hawky so you don't sound lame.

E.g. Someone hiding their phone when texting is hawky behaviour

The person is generally know as a Hawksman.