Here is one big thing that you gotta remember about ICs, they are strongest in the center of the stage. The main reason being that they don't gain any added weaknesses by being there (and they don't gain any added strengths by being on the edge or off the stage, since they aren't good at gimping characters), since chaingrabs work on any part of the stage and upsmash is a reliable kill move and kills off the top (stage positioing doesn't matter very much). The biggest weakness they avoid by being in the center are easy Nana gimps, since an opponent has to knock her further and work harder to kill her from there. So if your opponent wants to do anything fancy on the ledge, for the most part, you should let him and stay in the center of the stage just spamming ice blocks or hell taunting if you want to (keep in mind, good spammers can force you to come in). But, staying in the center works especially well against Kirby, since he only has one projectile, his up-b and its crap. You can be campy as hell against him and force him to come in. If he tries to fight back with Up-b, then just dash in and get behind him, for the free grab and free stock.