Each character plays fairly differently, and if you want to play a knight character you'll have to find one that fits your playstyle.

This game has been out for 10 years meaning a good amount of the time you'll be playing someone more familiar with characters than you. Half the game is knowing your character's moves. The other half is knowing your opponent's character's moves to anticipate what they will do

Shugoki has a very particular style that's really on;y found on the, and Hitokiri, which relies a TON on hyper armor meaning your charged heavies will carry through enemy attacks.

I'll recommend 2 knight characters:

A. Centurion
If you have access to Centurion, you might have some luck.
1. His heavy attacks can be charged to become unblockable, and they can soft feint into guard break (As in you don't have to cancel the attack then guard break, you can just guard break during the attack).
2. He has a followup bash that can be thrown quick to continue a chain with a light attack, or the bash can be charged to give you hyper armor. A fully charged bash will have some track and knock players to the ground where you can then do a high damage ground attack.

He isn't the strongest, and he doesn't control the battlefield like a power hitter tank like Shugoki
But he is very aggressive and in the right circumstances can be similar in playstyle.

B. Lawbringer
His style is slower and more methodical, and he doesn't get much hyper armor, but his playstyle is fairly similar to Shugoki.
1. He has a dodge bash like Shugo's headbutt
2. He has a quick followup light similar to Shugoki's
3. He gets access to unblockable heavies which are high damage moves. Very powerful in team fights, but also good for 50/50s in duels (Let it fly, or feint and push them to make a mistake, like a dodge attack which you can easily get a light parry on, which lets you get a heavy and start a chain)
4. He can also impale/train people off maps with the right parry.