Here are some of the combos I use with Sub, he’s a bit lacking in the damage department due to not having any damaging special besides Slide and EX Slide (not counting double freezes, the damage just isn’t worth it on them anyway), but he carries you across the screen like nobody else’s business and gets some nice wakeup setups after most of his stuff.
Mid screen:
B+1,2 QCF+3 j.2 B+1,2 2,1,2 BF+4/X-Ray (35% regular, 37% EX, 47% X-Ray)
2,1,2 QCF+3 dash forward B+1(whiff),2 2,1 BF+4/2,2 BF+4/2,2,2/X-Ray (Both BF+4 enders do 30%/31% each, Ice Sword ender does 28% and scores a techable far knockdown, X-Ray does 41%)
2,1,4 QCF+3+B BF+4 (26%/29%)
2,2,4 QCF+3+B BF+4 (23%/26%)
Corner-only:
B+1,2 QCF+3 j.2 j.2 B+1,2 2,1,4 BF+4/X-Ray (42% regular, 44% EX, 57% X-Ray)
2,2,4 QCF+3 dash backwards B+1(whiff),2 2,1,4 BF+4/X-Ray (39%, 41% EX, 52% X-Ray)
2,1,2 QCF+3 walk backwards B+1(whiff),2 2,1 BF+4/2,2 BF+4/2,2,2/X-Ray (same as corner above, not really optimal considering the other two options)
Anti-Air:
2,2 QCF+3 B+1(whiff),2 2,1,2 BF+4/X-Ray (28%/EX 29%/X-Ray 33%) Note: Depending on height, there are times when the B+1,2 chain will connect fully but it does not add any meaningful damage)
B+1,2 2,1,2 QCF+3+B dash forward B+1(whiff),2 2,2 BF+4 (33%/34%)
Corner Only variation: B+1,2, 2,1,2 dash back B+1(whiff),2 2,2 X-Ray (43%)
Can’t come up with anything else for now. You can always change the starter for one of his non-freeze normals like F+4, but I went with the highest damage possible for the initial hit.
If anyone has suggestions, I don’t mind hitting up the lab some more. I’m convinced that even tho his damage his subpar, he’s still very useable due to 2 unblockables with B+(2) and Ice Slick (technically 3, you can’t really “block” ice clone since you have to actually walk into it) and a great zoning game. I’m probably going to work on combos off the unblockables next, right now I’m just doing variations of the above but I’d really love to see if it’s possible to squeeze some extra damage out of them. I’ll keep you guys updated on what I find.