I have a trick I was talking to ADHD about a month or so ago:
You can do aerials with a banana in your hand, without doing stuff like Z dropping them and using an aerial to recatch them.
First obviously, you need a banana in your hand. Next, you need to be in the air.
Basically, you use Down B (Smash or Tilt, doesn't matter) in the air. It DOES NOT MATTER if a banana comes out or not (meaning even if you have two banana's out already, this trick will work). Now, before the animation ends, start buffering whatever aerial you want. What will happen is that Diddy will do his Down B animation, and then right after do an aerial. What's neat about this is that you can KEEP ON DOING MORE AERIALS by buffering consecutive aerials.
So say you do this, and buffer a Fair. If you are still in the air, you can buffer another Fair, an Uair, Dair, etc. So say you use Fair, and your opponent airdodges. No biggie, you can then try to Bair him/her as they move through you. You can also be silly and Dair over and over or Uair over and over for ****s and giggles.
Now, this may seem a bit useless/novel at first, BUT I haven't even gotten into the mindgames you can pull with this. Let's say you do this and first aerial you use an Uair. They airdodge/you miss, and you want to punish them or put pressure on them with a banana. Well, no need to worry. All you have to do to toss the banana instead of do the aerial is not buffer an aerial. If you wait a brief bit after the aerial/down b is over, and then input a command, Diddy will toss the banana instead of doing an aerial. So you can mix it up between a fast Banana toss or a fast aerial without giving your opponent time to guess before hand which one will happen.