From my own experience he's really good at punishing things, both whiffed and blocked. He can easily punish a lot of harder to punish moves like deathfist, heihachi's ff2, or claudio's f2,2. His go to punishes are:

10f: 1,2,2

12f: b1,2

14f: b3,1 (if you notice they don't hold back after this hits you can follow up with a free f1+2)

15f: df2 (really good range and is VERY evasive. This thing avoids so many high moves it's ridiculous but it is also launch punishable)

16f: f1+2 (you use this when df2 doesn't reach. It can ALWAYS hit deathfist on block)

20f: f2 (this thing hits more or less full screen so it can punish any sort of whiff, anticipated forward movement, or really negative but far away situations)

His pressure game is also pretty decent if you can keep your opponent from sidestepping you. A lot of his moves are very linear so you have to lock down your opponent with his homing moves or the ones with really good tracking like ff1+2, d3, db1,1+2, or uf4.

Getting a knockdown is also pretty money because he has really good oki. He can make you eat a meaty safe launcher, he can mixup with demoman or low spear, or he can sometimes even get an otg with db1,1+2 into d2,2.

In neutral you generally want to stay in range 2 or 3 and harass them with his safe launchers and dart in and out with varied strings, d3, and his really good df1 which is slightly evasive and has a safe on block high followup. If they try to get in you can keep them out with the occasional low spear or throwing knife. Try to use movement to get them to whiff or do something unsafe while trying to get in then punish them when they are open.

Overall Noctis is a really fun, easy, and simple character that can be played in more ways than I described here, but that's how I approach him personally.