A bit more info, I’ll add to the one’s that haven’t been covered yet.
You want to keep her out. Tron players get in by air, going for cross ups, option select throws, and that ground bounce. You want to keep her out until you can land a hit to level up. In early levels, use the range on Frank’s normals to keep her out and be ready for the throws. Zombies and pies work during the neutral game, just remember to be at least mid screen when throwing things. Her mixups at close range can catch people off guard when you’re not used to them. Don’t rely on chicken blocks because Tron is pretty good at hitting Frank’s toes (she also has a command throw that ca convert into big damage with the use of assists). You want to lvl up as soon as possible because Tron does not have any real reliable way to counter chainsaws (spam j:m: all day).
This match up relies all on momentum. If Frank can set up the pressure, Skrull can’t really do anything. His normals are quite slow and have poor range, except for a few. Skrull shines mid range, don’t let him set up command throws and meteor smash shenanigans. This match can be a problem in lower levels as Skrull can just snatch at you and convert into pretty good damage. LIkewise, you cant really zone him out because he has command throws, meteor smash and some long reaching normals. At lvl 4+ Frank can react to some of Skrull’s tricks. You can use anit air super, surivial technique or even j:m: on reaction to teleport and limbs. The command throws can be stopped with survival techniques or roll. Don’t get too predictable because Skrull can counter punish as well.
This can be a pretty bad matchup. Vergil can out range you in most cases (outside of lvl4+) and can sometimes be hard to punish with Frank’s slow normals. If the vergil player has the right spacing and assist, it might seem impossible to hit him. Be wary of teleport mixups with assists and don’t pushblock. Use your normals and try to level up as soon as possible (you also might want to tag out if you can’t get anything going). My experiences so far have been quite bad with this matchup (curse you Richard Nguyen!) and I usually have a hard time doing anything. Luckily he has low health and his specials can be punished quite easily (normals on the other hand can be difficult to punish because he has that :h::s::h::s: cancel that he can spam and make things really hard to punish). It might be wise not to fight him at anything lower than lvl 4, use your other characters for this match.