You can grab bananas with forward air, right? You should be able to grab them with your nair as well. Its been mentioned already, but if you see them on the ground, you can just air dodge right onto them, picking them up, if timed correctly, which isn't that hard to time. Diddy Kong isn't much of a problem when you learn how to deal with his bananas. Just avoid rolling left or right unless Diddy Kong is right in your face or behind you. Otherwise just stand up to avoid continuous tripping.
Diddy Kong alone isn't that difficult to deal with. If he doesn't have his bananas out, you can rush him which forces him to fight back, not giving him much of a chance to bring out his bananas, though I wouldn't suggest it. Just continue to space yourself well enough, toss the bananas at him, glide toss them if you can, throw them up, jump up and throw them down, etc. Just be creative. Either way, Diddy Kong will find a way to bring out his bananas.
Other than that, watch out for his Up B cancel. He'll just charge it, wait for you to attack and then his rocket will explode on you, which isn't good. His Peanut Popgun isn't too much of a problem. Unless he's trying to gimp you, which even with that shouldn't be easy since he can't aim it. 60:40, that's too steep in my opinion. Sorry.
Diddy Kong alone isn't that difficult to deal with. If he doesn't have his bananas out, you can rush him which forces him to fight back, not giving him much of a chance to bring out his bananas, though I wouldn't suggest it. Just continue to space yourself well enough, toss the bananas at him, glide toss them if you can, throw them up, jump up and throw them down, etc. Just be creative. Either way, Diddy Kong will find a way to bring out his bananas.
Other than that, watch out for his Up B cancel. He'll just charge it, wait for you to attack and then his rocket will explode on you, which isn't good. His Peanut Popgun isn't too much of a problem. Unless he's trying to gimp you, which even with that shouldn't be easy since he can't aim it. 60:40, that's too steep in my opinion. Sorry.