I recently stayed with chu dat, and after leaving from his house I've been inspired to play IC. Here are some things I need to know a little more about.
1. Grab combos. There are a few basic ones that everyone should know, like the d throw d air chain, blizzard d throw f smash kill, etc. I'm working on making my own combos tho. I've been working off the up throw, and trying to get nana to f air them to the ground after i up throw.
2. Desyncs. I think these are actually very important, and have a lot of potential. But I don't know many ways to start them. Obviously there is the dodge and roll, I know of the pivot desyncs. How does the jab desync work? I can only desync popo to do a forward b after a jab, but i'm pretty sure you can do more.
3. Saving nana. Sometimes I have a lot of trouble stopping my opponents from killing nana. What moves are good to hit them with while they chase nana down?
Wow, forward wants to play IC! I'm honored. You're an inspiration to my Falco game. ^_^
Anyways....
1.
Dthrow Dair is a staple CG. It works on lots of people(except floaties >_< Samus).
Dthrow Dsmash, I dunno how many characters it works on but I'm sure that it works on Sheik and Ganondorf. I find it hard to Dthrow Dair shiek for some reason so I just use that one.
Dthrow Blizzard, Another staple. Works on everyone if they don't DI, i think.
Dthrow SHBlock Only works on fastfallers and it's not guaranteed because they CAN DI. Kinda flashy though.
Dthrow Fair Regrab works on everyone at 0% only, after the first dthrow fair, they'll simply fall to the ground. Not to mention, they can DI the Fair.
2.
Roll and dodge desynches are great. but they aren't the only ones.
Dashdance desynch.
Waveland desynch is great.
Whiffed grab desynch. I've been using this a little more recently. It's a hell of a trick just don't use it too often. After missing a grab, you can make nana do whatever you want. Input is the same as a roll or dodge desynch in that you hold the command.
Taunt Desynch. Great for laughs. Basically the same as Whiffed grab/roll desynch
"A" Desynch This one is interesting and I question it's usefulness for you guys in the higher level metagame. Basically after doing any ground "A"button move(jabs, tilts or smashes), use Squall Hammer, resulting in only popo doing it and Nana walking behind him. LOL, I had once thought that I discovered this on my own but then I checked the desynch thread and noticed that it had already been discovered. Pressing Diagonally down will result in Nana doing Blizzard while you do Squall hammer, and since squall hammer ends before blizzard, Popo can land the grab. I don't know of it's usefulness though. Would it be useful against a CCer?
3. LOL, I'd say that it depends on the character. If a CF is flipping your Nana off the stage, it's a hopeless cause. I dunno though, sometimes my Nana is a hell of a fighter. Once, she freaking powersheilded a missile that was headed her way, KOing the Samus. She's awesome sometimes. I'd say use whatever you can to stop the attack, be it jab > grab or jab > Dsmash. The opposing player will ALWAYS read the human controlled player as a greater threat so getting close and giving them a smack or two will usually be enough to get their attention away from Nana.
That's all I can say. I don't think that my advice as viable because my ICs aren't as good as everyone else's so take what I say with a grain of salt.