#1 Andrew Chafin
Andrew Chafin gives me a lot of Aaron Loup vibes. He's a fun lefty to watch who doesn't have a long history of extreme success but is coming off of his best season. While pitching with the Cubs and Athletics Chafin went 2-4 with a 1.73 ERA in 71 appearances. Loup was coming off of his best season with the Rays before signing with the Mets.
For pretty much his entire career Chafin has been tasked with being a left-handed specialist. He isn't super overpowering, but he more often than not will get the job done. Loup is very similar in that regard.
Lefties have posted a .593 OPS against Chafin with just seven home runs in 577 career at-bats. He seems like the perfect arm to get in a division full of extremely talented left-handed hitters.
Chafin is a little more well-rounded than Loup as he's posted better numbers against righties than Loup did before this season. I believe based on his track record and the track record of left-handed relievers the Mets have signed in recent years Chafin is a great fit.