I mean shield pressure with repeated fairs, most people fair once then grab or jab to prevent a grab, I've never seen it used as a semi pillar.
The only way to beat ICs with any character is to not approach them, except Fox, he is fast enough to approach every once in a while.
Space nairs, and tilts, camp on platforms, needle camp, and ledgeguard like a champ, don't get grabbed, and if you do, make sure to smash DI out of dair throws, and survival DI for smashes, when you can gimp nana, learn her AI and just kill her at really low percents. Sopo really can't do a lot on his own. Below 60% dthrow dsmash chain is inescapable with either sideways DI, you can try to DI up and nair out of it a little early, ~45% I'm not 100% sure it works though cause I've never been on the sheik side of the match.