OK here would be my suggestions:
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Run DMX
Your Meta Knight seems pretty good. Against Strong Bad's Pit, the first game was basically yours so no real mistakes there beside of the SD
The f-tilt got crouchcancelled so often. If Pit is under ~40%, go for more dashdancing for the purpose of grabbing.
I think you sometimes could have evaded one or another followup by combo DI but I don't know the correct combo DI in that matchup too.
What damaged you most in game 2 was imho the counterpick. Go for stages that have huge side zones or a platform setup that benefits you.
Although, he is a fastfaller, MK is the secondlightest (!) character in the game so Wario Ware isn't good for you (for stage choice I personally ban Final Destination, Yoshis Story and Wario Ware mostly, because of no platforms for combos or early death).
I would have taken Battlefield, you just SD'd, didn't really lose apart from that, did you? Dreamland might also be worth a try but it is better against characters that have worse recovery than you. He banned Yoshis Island wisely. Skyworld is also good for MK but it was banned I think. It is always your preference but I wouldn't have aimed for Wario Ware. I kind of agree with Lylat against Pit in game 3.
Against Egman, you won 3-0, so it didn't cost you, but you used too much dair in general. Double jump into dair is unsafe against every kind of WD away -> grab or other punish. Sometimes you used the dair because you were too high over the ground, probably short hop more instead of full jump. There are exceptions but against most character approaching from a full-jump-above is bad whereas approaching from a short-hop-diagonally-above (with nair usually) is better.
I saw some wiffed dash grabs. Might be execution errors but always keep in mind JC grab has 31% (!) more range than dash grab. Also think of dropping those Up-Smashes where you barely hit for SH uair becuase you get no followup out of the Up-Smash and could get punished if the opponent SDI's correctly. Otherwise, great punish game and use of bair. Good performance!
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Kaysick
Good games! Basically, don't go that high in the air because then you have to do the punishable dairs agains. Grab a bit more (this one is really important) and use fair a bit less. Actually, against Wario the fair usage was very good because Wario has neither the range to outspace the move nor the mobility to punish the endlag but there are few matchups where you should use it that often. More SHFFL nair instead of these Fullhop-> fair->Jump again->Dair. What surprised me positive was your control of the Shuttle loop. There are not many players using the possibility of turning up and down right and they will just turn up and fast-fall then if glide finished when they could go for a platform land or a techchase. You were playing more of a control-based MK trying to use the upper air room for himself and slowly getting in. That is legit but if you are fighting a character with a projectile you need to go in more directly and then grabbing and SH nair turn into even more important options. Again, my critique might be slightly inaccurate because I play kind of a different style more ground-oriented (Dashdance into grab or SH nair).
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Chexr
Your MK is very good. Your techchases and combos were definetly on point and the Dimensional Cape usage was also impressive. My main suggestion would be thinking a bit more about your approach game. Most of the time you were just SHFFLing in and while this sometimes worked you aerialed your opponents shields too much and got shieldgrabbed. Sometimes a spaced d-tilt is good to avoid that because except against grab range monsters you stay out of their shield grab range. Also dashdancing and grabbing a bit more would help, your JC grab has a decent range (if you dont count actual ranged grabs like Link, Samus or Yoshi its ranked 8th). Also, dont dair people that arent in a positioin where they have limited options. It can lead to combos but it is too punishable. If you know it won't be shielded (your opponent jumped or something) it is actually good. Didn't watch it all but more than half an hour of it and congrats for winning it.