SSBU/Kazuya/Strategy

Out of Shield
Kazuya's out of shield is bad. His fastest option is frame 11 with UAir and Grab. His second fastest is frame 12 with USmash and Up B. USmash has frame 7 heavy armor, but the armor is pretty weak. It only tanks up to 7% base damage. Kazuya can also do jump cancel UFTilt or UBTilt which are both frame 15 at best and have intangibility on his lower body.

Out of Parry
Out of parry, Kazuya can get his best punishes. He can get his combo starters and get his ToDs in. He can also Crouch Dash out of parry for extra intangibility, though EWGF gets more.

Disadvantage
Kazuya has a bad disadvantage state. He is a heavy, so he gets comboed pretty hard. His fastest escape option is frame 3 with air dodge, which is not bad, but because of his bad air speed, he is not going to get far with the air dodge. His double jump is very slow. It takes about 12 frames before he starts moving up, but he will go pretty high. He can do an aerial with the double jump to make the double jump faster, but Kazuya will not go as high. Offstage, Kazuya has a far recovery, but it is slow. Kazuya can stall with Neutral B and Down B but they are very laggy and can spell death if the opponent is ready to edge guard against it. It is best to use Up B first before the double jump as if Kazuya gets hit, he will get his Up B back, but he will not get his double jump back. Side B can also be used to go to the ledge but it is not recommended as it takes a while before it can grab the ledge. Once Kazuya is on the ledge, he has all the normal stuff. Except, because of his slow double jump, ledge drop double jump is very reactable. And doing an aerial after it is very slow as well. If he does the aerial too early, then he won't go high enough to make it onto stage. Kazuya can do ledge jump > side B for an aggressive ledge option as if it crumples the opponent, Kazuya gets a combo. But it is not safe on shield and it gets beat out by all hitboxes and it doesn't hit low profile hurtboxes. If Kazuya does neutral getup, he can do Crouch Dash to only have 2 frames of vulnerability. And one of the two frames of vulnerability he has upper body intangibility.

Stages
Ordered from best at the top to worst at the bottom.

Final Destination Northern Cavern Town & City Kalos Pokemon League Small Battlefield Smashville Hollow Bastion Lylat Cruise Pokemon Stadium Pokemon Stadium 2 Yoshi's Story Battlefield
 * There are no platforms meaning the only way the opponent is getting out of combos is by the Kazuya player's own execution
 * Final Destination but with side platforms. They are out of the way for most combos to work, but are low enough that Kazuya can easily access them with Ferps tech  if he has to. This stage also has the lowest ceiling of all legal stages and Kazuya mainly KOs off USmash and Up B.
 * The first phase allows the opponent to platform camp Kazuya but the second phase and the transition are both essentially FD.
 * Same layout as NC but the platforms are slightly higher. This makes accessing them harder. Also, the ceiling is higher making USmash and Up B KO later.
 * Small Battlefield offers Kazuya the best way to get Ferps tech combos. These can lead to earlier KOs due because of the platforms.
 * Smashville is the small stage, which makes it hard for the opponent to run away from Kazuya, as they cannot get far. The platform, though, is very high making Ferps tech hard, and the platform is large making getting a tech chase also hard.
 * Hollow Bastion basically offers the same thing as Small Battlefield, but it is harder to get the tech chase due to the platform's size.
 * Lylat's slants don't affect Kazuya much in neutral. If anything, they benefit him.  UBTilt becomes plus on block when Kazuya is lower than the opponent. The platforms are about PS2 height. The blast zones are a little close making KOing better.
 * PS2 but the platforms are lower, so Ferps tech is easier.
 * PS2 is larger allowing for more non-platform combos, but can also use platforms. They are a little higher making Ferps tech slightly harder.
 * Yoshi's Story is large enough to allow the opponent to platform camp Kazuya, but the high and wide platforms mean that if Kazuya does catch the opponent on them, then he can KO them early. On the slants, UBTilt becomes plus on block.
 * Battlefield's platform layout allows the opponent to platform camp Kazuya if they can. It also hinders him from getting out of juggles due to, if he lands on the platform, his bad jump squat. Jumping off of platforms is the main way to get off of them due to the sticky ledges.  Kazuya having the slowest jump squat makes getting off them harder when being pressured.  The ceiling is higher than SBF and the top platform is not likely to be used in combos.

Fighting Kazuya
Fighting Kazuya will involve a lot of Rock-Paper-Scissors-esque gameplay. Kazuya's entire moveset revolves around a fully intangible, combo starting anti-air attack. That being said, aerials are no good against it. He will either hit the opponent right through them or go through it untouched. The only way aerials, or any move will work will be by whiff punishing it. Some moves, though, are much better at whiff punishing EWGF than others. The reason is because his upper body has a longer period of intangibility than his legs. Those moves are the low pokes. EWGF's hitbox is all above his knees, so a limb of DTilt should not get hit by Kazuya. If Kazuya does hit the opponent out of their DTilt then it was because Kazuya was close enough to the opponent's body to hit them, (or the DTilt doesn't have enough horizontal range). Also, because EWGF's hitbox is above the knees, some characters can just straight up crouch under it and it will whiff. As for those who can't crouch under EWGF, crouch canceling EWGF will not let Kazuya combo off of it, unless he reacts to it, in which, if he does, he will not be getting a ToD. So what does Kazuya do vs low pokes? He does high pokes. He uses his aerials, or his high profiling moves like UBTilt, UFTilt, or DA. To beat Kazuya's aerials, they can do their own aerials to air-to-air, or use grounded anti-air moves. Kazuya beats air-to-airs with his own anti-air attacks (UTilt, BTilt, UBTilt, or EWGF) and he beats anti-air attacks, or spaced grounded attacks, with his own grounded moves. These include basically any tilt attack and Hellsweep. In disadvantage, it is best to DI his EWGF in. This will avoid combos like EWGF > FSmash and EWGF > NAir > NAir > NAir off the ledge. If platforms exist it does not mean to DI to the platform. Instead DI should be mixed between landing on the platform and not landing on the platform to make Kazuya guess wrong. As this is the only point in Kazuya's combo where a ToD is not guaranteed. What is guaranteed is ending the combo early with an aerial to launch the opponent off stage, but it almost never KO.