Every set up in the game is cheap if you spam it. Only exceptions here are sir Dan but I found loop holes past the air tech down and I told ginta about it. And probably nariko's because you can see her shield from a mile away. Ratchets isnt as cheap as raiden but its annoying I'll say that. Drakes is easy to dodge but he has a great level 1
I was really surprised there was a loop hole to down air teching. Nariko is easy to see and not very reliable so I mostly go for her level 3. Ratchet's syck cannon does leave the Ratchet wide open if they mess up though. As for Drake I only seen Drake confirm his level 2, so I can't say that much for him.
Ginta I can teach you some sick dante combos, I don't the usual ap burst combos mine are like 20 times harder and without the bold cancel
Ok cool I might show you some Sackboy combos as well that many people don't know about.
I usually mess with my opponents mind, and catch them off guard with my Level 1. I've also stolen a kill from an Evil Cole's Level 2, Raiden was caught on the outside of E. Cole's Level 2, and I used my net, E. Cole only got one kill.
I do often times use Down+Square into Spike's Level 2, if not I just try to catch everyone (FFA) off guard and use it.
Recently, I just found out a kill confirm combo for Parappa. I wasn't sure if that was cheap or fair.
Like Ginta said, Sackboy's electric pad and web grab aren't the easiest one to confirm kill.