Try to punish assassin strike with SG 112 it's a little bit easier also don't take 212 there's a gap you can use her d3 to get out of it. Also don't fall for most of his thing his pressure is mostly fake and without 212 most robin will be lost + none of his trait cancel are plus the best one is neutral you can armor through it (mbb3) or backdash. If you see him birdarang punish it it shouldn't be too hard to punish it on reaction with manta(his air charge thing or his f21 string If they are close enough) or SG( her trait and b12 If they are close enough)
@Yoaks
Good information, and I agree with all of it except the part where he recommends a MB B3. MB B3 after his kancels is risky because Robin's D1D2 would beat you out of it.
Also, with Manta, throwing out a DB3 from midscreen or jumping from range to hopefully land an air DB3 is good. If you do it from range, you should anticipate his projectile as his follow up since you'll be at minus frames in which kase you kan use the standard methods of avoiding it.
With Manta a good way to avoid his projectile is to time your jump back after it loses tracking (practice in training mode if you don't know that timing), from a lot of spacings Robin kan't kontest this. Then you kan float to avoid the projectile. If he jumps to hopefully air to air you (since characters without float avoid it easier by jumping forward), then you kan punish him with the 5 frame air shark attack.