Helpful ??
I have Ditto Mirrored and it is the easiest match up for a Diddy player (assuming ur better of course lolz) but yea, I always say that the best match up for any character is just a better player using the same character...
As far as the actual match up goes, to tell you the truth I am too lazy to type it out bu ti will give some tips-
1. Do Not Use Your Own Bananas:
Unless you know you have good control and placement of them then there is a chance that your opponent will take yours and might **** you with them. Dont worry though you have many options without bananas in a mirror match. However a good time to use your own bananas are when you already have control of your opponents bananas, thats when the banana **** begins lolz.
2. Short Hop air-doge or Barrel Charge against banana happy players:
Most Diddy players base about 80% of their gameplay on their bananas so you in return need a way to disable them. SH air dodge against an opponent that loves to throw bananas at you so you can catch their banana and gain control of it. Remember, once you take away the average Diddy's bananas it will cripple their gameplay. And as a side note, if you miss catching the banana with the air dodge the worst that can happen is that you will take less than 5% from the toss, but you will not slip because you cant slip if your in the air.
3. Edge Guard and Gimp:
Again the average Diddy usually pulls out bananas and tries to set them up when they have an opponent off the stage instead of edge guarding. You want to do the complete opposite. Remember, Diddy's Recovery is easily gimped, especially if you have a projectile............ like the peanut gun. All you have to do is hit Diddy once and that will usually destroy their recovery, but you as a Diddy player probly already know that.
I hope that was useful, sorry about the quickness of it but I'm just a lazy bum lolz. In short, work on controlling your opponents bananas more than setting up your own, edge guard/gimp, and the best advice of all quoted from me "Be a better player."
-advent