Toon Link arrow and boomerangs can be Ftilt and Bair cancelled, so normal approach of Ftilt and Bair works fine. It's just the bomb you have to watch out for. You can airdodge catch it, shield, or roll. Just be careful about rolling towards because TL will be on top of you after he throws a bomb.
DDD Waddle Dess can be blocked the same way. Just Bair and kick them away. Be careful not to Bair near the ground near him, or you risk shield grab, and we all konw what happens then. UpB is a nice approach on him when you get close, he won't be able to shield the whole thing, and you can rack up 15-20% easily at early %.
Against ROB you're just going to have to get good at predicting then blocking/dodging the laser and gyro.