hey so i think i'll be playing with you guys soon, lets all get better together :D
i dont main mario or anything but i'll share my thoughts:
00:02 really nice u got the uair in, but at this percent i'd think there are better options than dsmash, maybe utilt or grab could lead into something else. after he is knocked down u immediately backed away, covering the roll in option with bair, which is fine, but maybe you shouldn't give him so much space, i donno.
00:05 really nice grab. Not sure why you went for nair instead of another bair, which seems like could lead to many different things
00:42 just wondering if you know how to Wavedash out of shield, it's pretty good in these situations for retreating or going in (its honestly one of the most important techniques imo)
00:45 if u anticipate his attack you can try to do one of those mango run to shield and counter attack. when u are cornered like that most marths will want to f-smash it seems
2:36 when ur away like that maybe u can try and get a few fireballs out, it might help ur approach
end of first game---
i dont think nair works well against marth, maybe you should try to get in more uair and bairs (ex. run away then wavedash back in with a bair)
in general uair with any character ***** marth so i assume mario's would work too
u seem to have trouble getting in, maybe can do more of those run in shield and wavedash out of shield into a grab
2nd game
4:33 are you trying the double up-B with mario? if you donno what that is, u can wall jump after ur up-B and then up-B again, its kinda tricky though
4:37 seems like you dont Jumpcancel grab very much, try to learn it if u can, it has less lag (but i heard for some characters its better to do dash grab, not sure if mario's one of them)
5:40 i think you could have went for another bair right away
5:50 if he starts dodging too much of ur stuff u can start doing empty hops when it seems like u have clear advantage, or any other kind of waiting move, it works pretty well if u know their habits
3rd game
7:30 i know nair comes out quicker but it also has a smaller hit box. i feel like most of the time it'd be better to space the 2nd bair instead of using nair
9:50 utilt instead would have hit :D
4th game
10:40 instead of backing off and throwing fireballz i think grabing ledge to bair or trying to crouch cancel downsmash might be better. one of the falco edgegaurd mango uses against marth is to grab ledge and do a regular getup into a crouch cancel downsmas. i feel like it should work with mario too. in general mario has great edgeguard with bairs after grabbing the ledge, there are a lot of options from there.
10:54 not sure if it matters but i would have downB stalled and try to hit him with it so then i can upB back, not sure if it'd reach but doesn't hurt to try right?
11:20 just bair him right after his dodge :D
12:06 not sure what ur doing, u made a lot of poor recoveries
i feel like u should try out jab or grab or utilt after fair instead of always dsmashing, especially at low percents.
5th game
13:47 dont get baited, just try to space bairs or fsmash if he uses aerial from ledge
14:15 try to chain short up uairs
in general try to see if u can combo harder XDD its pretty important against marth. once u get in you gotta make it count.