Answering question that
WILL pop up.
Uair combo related questions(the most spammed question on this and most likely ZSS boards)
Go practice in T-mode, if you want to practice uair combos with staleness and rage being a factor go play friendlies or practice in Smash mode 99 stocks. You honestly shouldn't jump to uair combos, actually try to learn the character(ledge coverage,edgeguarding,neutral,combos ect) instead of trying to abuse uair combos just because you got moist seeing Leo and Abadango play MK.
Do i need to fast fall inbetween uair combos?
No you don't, you only do so if you know the next jump-->uair won't connect but that's honestly you being incompetent since you should do it at the right percents.
What control scheme should i use?
Use whatever YOU want, for reference: Leo(USA MKs in general) uses smash stick, Abadango(Japanese MKs in general) uses tilt stick.
When do you use Tornado?
To cover get up options which conditions your opponent to not buffer a get up, landing ontop of your opponent is a mixup, out of dash attack at low percents, to pressure opponents who tries to platform camp us.
How do i DI uair combos?
There's no straight forward way, just mix it up, you can DI away so you get sent really far of stage making the MK user think twice before going for shuttle loop. But MKs are picking up on this and will most likely hit you with the back of uair to get you back on stage(shout out to Leo vs Vinnie). Shuttle loop is rather simple to DI don't think anyone finds that complicated unlike Boost Kick.
What does MK look like under the mask?
Is Dtilt to Cape/Shuttle loop a true combo?
Dtilt to Cape is guaranteed on Little mac(maybe Charizard) but its not on everyone else. If they miss the tech they die.
Does MK go even with Sheik?
Hell no.
Does MK beat Sheik?
Leave!
Who's a good secondary for MK?




and sheik but the majority don't wanna pocket her nowadays cuz she's boring and mainstream.
If you want to avoid MK dittos(alot of us do) these are good choices: 

What stream should i watch in order to see top/high level MK play?
Landiego
TrainingroomMTY
Teamoxy2
Abadango
Others depending on tournament Tyrant,Ito,Aba,Leo ect attend.
Don't watch: Xanadu, Showdowngg, Tourneylocater, VSGC, Sktar/Ktar/Rushoursmash. They most likely have no MKs at all, if they do then they aren't gonna teach you anything useful.