Critiquing a few of
@Matsushi 's matches from Dat BlastZone 7:
1:18 - Optimization here, you probably should've grabbed him into D-throw -> U-tilt, possibly jab.
1:20 - Would've liked to see you Z-catch to Instant Toss the Levin sword there.
1:27 - Did you still have your double jump here? Landing Bronze fair pretty weak option. Falling Nair, Double jump away or Elwind up to the platform all likely better options.
1:32 - Very nice. Exactly what I would've done on that Elwind.
1:35 - Missed opportunity to catch your Fire tome. Having the item is SUPER useful vs. Falcon since it's a strong threat to prevent him from just running in.
2:23 - That Elwind was wayyyyy too high up. You got lucky he botched his punish, good stuff killing him for it at least.
2:32 - Perfect Arc -> Nos. Exactly what I wanted to see.
3:06 - Fair him there 10/10 times. Puts him offstage and in a bad position, Uair at that percent doesn't have amazing reward.
3:10 - Beautiful pivot grab.
3:14 - You gave up a bit too much space here, needed to stay closer to the ledge so you can react.
4:16 - GORGEOUS NOS. ARTWORK.
4:38 - Jab there probably would've caught him.
5:00 - Unfortunate input botch, but you picked up the kill anyway.
Very solid Game 1.
6:49 - I think a falling Nos there would've caught him, but he did spot-dodge. Unsure.
7:07 - Should be able to punish a shielded gentleman with Grab there, I think.
7:15 - Try to be careful with the standing Arcfires, he's caught you a few times at close range on those.
7:57 - Nice catch with Fair.
8:05 - Risky to run in there. I probably would've just jumped and safely Nos'd him once he let it go, further widen the lead.
8:20 - Yeah, that's what I meant with the standing Arcfire.
9:17 - You got preeeetty lucky there, haha
9:22 - Falling Uair there instead of Elthunder. Much higher reward.
10:19 - You should've died for that airdodge, but he chose to Uair instead of knee.
10:30 - LOL THAT DI
I am less knowledgeable on Sonic, but I'll do what I can here.
1:00 - Always watch your sword. Items are key against Sonic.
1:15 - Arcfire is very hard to use in this match-up for exactly that reason. Sonic can get under/around it annoyingly easily. Try to stick to falling Thunder variants.
3:40 - That ledgeroll was not the greatest idea there, but I'm sure you realize that.
3:58 - That was such a great decision, just botched the input. D:
4:24 - Excellent punish.
5:30 - Ahhhh, just a series of unfortunate decisions there. Sonic's Bair is frame 13, so you should be able to react to it as long as you're expecting it and pay close attention. He doesn't have any other option he can do if he's telegraphing a bair. The ledge-jump Uair was just a poor choice there. He was too far away from the ledge for it to matter.
I'm out of time on this lunch, but I'll try to get to more later.