Derping around with various kameo's more, and I keep coming back to kano. Ambushes feel like they really help sub's gameplan, and kano being the diet zoner kameo is also something sub doesn't mind.
I've also noticed there's a gimmicky as shit setup where you hit a slide, call kano ball and hold it, jump over them and clone, release the ball. If it hits it barrels them into the clone for a combo, but it's heavily scaled and with shit gravity so i'm not sure what you can do.
Normally I'd see this as the perfect opportunity to do some nasty setup, but i'm really having a hard time with that on sub. I feel like the core of that is either ice clone (discussed to death) or deadly vapors. For vapors, I just can't seem to find the right timing to screw with their wakeup. I know i've seen setups, but it looks like it's super conditional, which is a shame.
Honestly the oddest thing about sub's kit is that by default you're probably ending almost all your combos in slide, and yet due to sub's awkward strings and setups, point blank is probably a disadvantage for him.