Match 1
0:35 - Usmash was so horribly predictable here, of course he shielded it.
0:44 - Fsmash. It's punishable, and I think you see why.
0:53 - You keep throwing out Usmashes that will not connect. You could even go for a Bair kill at this point, since you're not utilizing any of the safe setups into Usmash. Sliding shield into something unsafe, or Dair, or spotdodge something, etc. etc. You mostly stand in place and try to land an Usmash. You really seemed like you were getting anxious here, and that's why you kept taking damage.
1:21 - This was a good use of Usmash, and you finally landed it. Waiting until he had to pick up the banana and going for it? Good stuff.
1:51 - Good use of Jab frametraps.
2:05 - Shouldn't have used your reflector here to block the peanut, especially considering how slowly it travels and how quickly Diddy can make up that distance.
2:14 - Same Jab frametrap, but if you could have faked it, Jab->Dsmash would have greatly helped your game. You did it at 2:20, but it would have worked just as well here.
Match 2
0:10 - Don't be afraid to approach the ledge. Moving away just gives him more time to setup. If you can predict his getup, that's free percentage and maybe even a kill.
0:19 - That would have been a good time to punish with Fsmash.
0:31 - You tend to do that getup a lot - Fair is good, but you got predicted and punished for it this time. Be glad he didn't spike you.
0:38 - More laser pressure! If he's all the way across the map, shoot those lasers!
0:58 - Even if you were predicting him going on the stage, Fair was not the right punisher. (Hint: You're facing the wrong way.) Bair would have worked, though.
1:01 - LOL MINDGAMES. That should never work. Seriously.
1:15 - And, you get punished for Fsmash again. Stop using it so much.
1:30 - The last few seconds before this, lots of random jabs. In the wrong direction. Not to mention the Usmash. Don't throw out attacks randomly.
1:49 - Good job using Fsmash to punish rolling.
2:00 - You missed a bunch of opportunities to Dair>Shine spike, or even just shinespike in general in the last few exchanges before this. Capitalize on mistakes.
3:01 - What did I say about you abusing rising Fair off the ledge? Eat spike.
3:09 - That's the first time I've seen you shine stall all match.
Overall, you have good fundamentals, but you don't seem to utilizing all of your options. Second match was much better than the first, but you seem to be slipping up on different things during each match. You seem to really have trouble capitalizing on your gains, though, but that just requires more practice and ability to read your opponent. Good job; keep going.