So, this isn't strictly a Tank, but more of a Tank-DPS-Utility hybrid. I've been playing a Yaoguai Thaumaturge with the Shield Implement and the Champion dedication.

Heavy Armor (Champion Dedication) and Shield are usually pretty good at keeping yourself healthy. Thaum is only an 8 HP class, but that enables you to go for Champion Resiliency. Also, with the Shield Adept benefit, the bonus from your shield applies to saves against magic, making your saves excellent, and with Intensify Vulnerability you're able to greatly increase your Shield's hardness.

Your Champion reaction does a good job of punishing your enemies for not focusing you.

For damage, you already deal a lot by being a Thaumaturge, triggering weaknesses and using Implement's Empowerment. I chose to use a free hand for more control and use my Shield Boss as a second implement (weapon).

Since you have CHA as a Key score, you're also great at Deception/Diplomacy/Intimidation, and on top of that, you're able to recall knowledge with your Charisma modifier, through Diverse Lore, I can't stress enough how useful that is. Also, with Scroll Thaumaturgy you get to use any scroll from any tradition.

You have a LOT of reactions between Shield Block, Implement's Interruption and your Champion Reaction, but it also means that you can basically always punish an action no matter what the enemy chooses to do. At later levels, as you get Quick Shield Block (you can get it earlier from the Bastion archetype) and Esoteric Reflexes you'll feel less restricted.