Depending on how fast/safe Corrin's Neutral B actually is, it might be one of their most reliable killing moves competitively, via uncarged DFS -> charged chomp. I don't know the exact frame data on the uncharged shot, but it seems to come out just as fast as Bair/Dsmash at 1/4x speed. However, since the projectile takes some time to travel, it ends up being between Bair/Dsmash and Fsmash in terms of actual striking speed (though the chainsaw comes out as fast as bair/dsmash). Unlike Side B/Dsmash/Fsmash though, you don't have to worry about sweetspotting the move.
However, the best thing about this is that it works in the air too, because it makes Corrin stall to line up with the chomp. And even if you miss with the shot, the chomp is still active. Meaning that it has more versatility on how and when you can land the move in the match, also factoring in that you can delay/charge the blast. 20% damage from the chomp alone is nothing to scoff at, so the opponent is under the constant threat of being hit by DFS at close range. Extremely useful for punishing mistakes.
What I'm worried about though is how well opponents can Smash DI during the stun to avoid the chomp. Corrin's viability will lower or raise quite a bit depending on this factor alone, since I feel as though Corrin's killing poweress at CQC is much weaker otherwise. How threatening he/she can be at CQC greatly hindges on the effectiveness of this setup, IMO. Lastly, one weakness that DFS definitely has is that it has the endlag of a Smash Attack (to be fair it deserves it though).
Overall though, if you combine long range pokes with CQC DFS, you can constantly put opponents under the pressure of dying at higher percents...just as long as uncharged DFS -> charged chomp works as effectively as I hope it does.
Other things I've picked up on for Corrin is that, besides chomp, reverse sweetspotted Dsmash might be the next best CQC kill move. It's faster than uncharged DFS, and it deals a solid 14% and sends the opponent at a low angle. And because of its speed, it is easier to sweetspot the move in general. With the combination of Bair, Side B, B Reverse/Wavebounce DFS, and Dsmash; Corrin's back isn't all that vulnerable and can actually be fairly threatening.
What makes me REALLY sad though is that you can't pivot Dsmashes. This would make Corrin's Dsmash so much better, and easily their best ground move for kills. So that's a huge bummer. :/
Oh, and Side B is extremely fast for the amount of range it has. Although you have to sweetspot it, it is still going to be great for surprise kills. Missing with it sucks though, and leaves you quite vulnerable. Especially if you didn't pin the ground with it.
One of Corrin's biggest weaknesses to me though are that he/she feels very lacking in solid OoS moves. Usmash has no horizontal range, Up B is slow and doesn't kill well (despite having some invulnerability), and Side B just soars over people's heads at close range. At best, you can swat people away with Fair or Nair, but neither of those things kill. Corrin is definitely weak in shield.
Recovery is also an issue, but it's not super bad. Just subpar. But this is just my initial impressions on it. Could be slightly better, but as of right now, it feels like a weakness to me.
Lacking a fast foward killing aerial also sucks, but hopefully DFS patches that up slightly.
Corrin's biggest weakness of all though is the general lack of moves that send the opponent a good distance horizontally. This is a glaring issue, because it is a bit of a pain to get opponents offstage with Corrin. Ftilt, Dtilt, Fair, Nair, and Dash Attack all send the opponent up. And you want to save Fsmash, Dsmash, DFS, Side B, and Bair for killing the opponent. So good luck for getting the opponent offstage. It also affects Corrin's edgeguarding game, as well. Large blemishes that should be considered when playing him/her.
In summary, Corrin feels like a solid mid-tier character to me. Great strengths hindered by unfortunate weaknesses. Definitely won't be making waves unlike the high/top tiers, but has a solid enough set of tools to stand his/her ground in the current meta. Either way, this character is really fun to play.
