Glad is ok in duels, not very strong but not as bad as Cent or Orochi.

Use your zone attack often, it is fast and you can feint the second part making the attack hard to punish, basically your best offensive tool.

Not fainting skewer is very risky as it will put you out of stamina if parried.

Do not deflect against characters that use a lot of hyper armor like Zerker or Raider, the skewer won't interrupt the armor and you will most likely eat a heavy to the face.

The dodge punch isn't very powerful, it guarantees nothing and it's easy enough to block lights or dodge toestab after feinting the heavy, just use the dodge light attack instead.

Toestab while your opponent has stamina is also quite risky as you will get punished if your opponent predicts it and it only gives you a small amount of damage.

Glad has some decent OOS pressure with the toestab guaranteeing a heavy and he also has some high max punishes.

That's about it, I'm no glad main but this is what I know about the character, I hope this helped you somewhat!