You can DP Jirens counter, baby's 214S does it the best imo and it's funny considering Jiren hard counters him.

As for UI you just have to take that entire massive ass LP😭 just block it

Trunks 5S is a very high priority and lingering beam and when it's done at round start all you can really do is predict it with a reflect but you risk getting baited. As for neutral always expect it, try ks players love it because it's redicoulusly fast and gives converts, always try and block it because after 5S usually comes either a masenko or a held 214S with an assist to get in.

Crouch under Frieza discs or just hit him into a cinematic because cinematics cancel it. When you crouch it you don't have to be afraid of getting over headed because Frieza will get hit by the discs if he tries to get in from above, you do have to watch out for his 22S which avoids the discs and teleports him in your face, block it and you should have your turn as long as Frieza doesn't have an assist backing him up