Thresh can set up ganks easily with his Dark Passage . Be wary if he is standing near walls or throws his Lantern behind him.
Thresh has a ton of crowd control in his Death Sentence . If he hits it he can reactivate it and fly in for a Flay which will displace you and slow you more. Stand behind the minions to reduce his chances of landing a .
Flay passive enhances Thresh’s auto attacks. Try avoiding throwing hands with Thresh when his empowered auto is available as he will chunk you down!
Stay behind minions! Thresh cannot go through minions so just being behind them will keep you safe from it.
If Thresh throws his Dark Passage to save an ally, you can stand on the lantern and body block it or use wards on it.
Most of Thresh’s abilities have long cooldowns during the early levels, if he uses them and doesn’t hit- make sure to punish him hard.
Thresh’s main power spike is when he gets max CD. If his lands, he will be able to lock you down until one of his allies can kill you.
Boots of Mobility on Thresh are terrifying! His roam potential and ability to get ganks off well can cause problems for your team. Ping missing as soon as he recalls or leaves lane.
Be wary of Thresh once he hits level 2 since he will have access to both Flay and Death Sentence . Avoid his at all costs otherwise you may just lose lane at level 2.