have wall(s) down (sometimes immediately at the start of the match) and make sure Omen’s floaty jump is punished.
make sure you shadow counter his f+HP (the sabrewulf 1,2 forward slash) - a lot of omens throw fireballs and do the 1,2 slash while you’re blocking the fireballs.
depending on the omen, you really need to know their manuals, as omen can do one chance to break manuals off of throws and fireball strings.
if the omen is far away, place a wall behind you and quickly pick it up so you can stop any aerial threat or fireballs he throws. bang at him for a bit as you close the distance, and then use your quick normals to bully him in the corner. I typically use sLK to sLP, to sMP, then cHK (stomp)
it also helps to play sets with any Omen’s u meet in ranked or exhibition.
i’m not incredible by any means. but i do love the game and learning these MUs. I’m in it for the long haul. I’d say first focus on one or two omen tactics to stop and master. such as shadow countering his 1,2 forward slash, and breaking his light Chun Li kick linker (the light linker is the slowest one). Do that for a while, until you can stop him whenever you feel it’s right.
Lastly, general Aganos tips:
1 don’t throw out ruin unless you have instinct to cancel into if the ruin is blocked.
2 if you’re opponent is close or walking towards you, dont forget shadow lariat is throw invulnerable
3 although, Aganos’s damage is mostly reliant upon walls being down (essentially an elongated setup), make the effort to close out rounds by using the lariat linker (particularly the shadow version) and use the lariat ender. Without a wall setup, this is Aggy’s best way to get max damage (especially if you’re able to get to let a level 3 or 4 ender). … I repeat/rephrase … If you don’t have any walls behind your opponent and your opponent’s health is relatively low, IMO it’s the priority should be to close out a round using lariat linker/ender damage versus building chunks in a combo.
Hope this helps!