Hopefully the trend of Hasbro actually making figures outside of just the main cast keeps up, and we get some deeper picks from S3. I'm probably in the same boat as everyone else as far as what I want, though
-Peli is a must. She's the character with the most appearances aside from Mando and Grogu in these shows, and I love how casual and grounded she is as a character. Great opportunity to throw in a Pit Droid or a Tredwel (maybe with some playing card hands too?)
-Gorian Shard. As soon as I saw this guy, I knew I had to have him. Unfortunately Hasbro would probably slot him be a deluxe release given how complicated the sculpt would be. There's rumors that seem to suggest we haven't seen the last of him either, so hopefully that would bump his priority up a notch.
-Alamite Warrior. These were the cave-dwellers who attacked Mando in the mines. They're aliens, they're Star Wars-y enough, and I think it's more likely than not that we'll see these guys, considering that most "troop" builder characters get made these days.
-Burg, Xi'an, and Qin - We have Bill Burr, we have Q9-0, we even have a New Republic Security Droid. Not getting the rest of the heist crew would be unfair at this point. Burg would probably be a deluxe due to his size, but Xi'an and Qin are easy basic releases. They would require (gasp) new tooling, so Hasbro probably isn't rushing to get them done anytime soon, but it'd be nice to round out a group of new media characters so completely.
-Valin Hess - For the unaware (I'm assuming everyone), this was the terrifying Imperial officer who had an extended conversation with Bill Burr in Season 2. I loved the episode, but this scene stood out as something new and exciting in Disney Wars-- tension derived through dialouge rather than an overly long action scene. He's also an easy figure for Hasbro to make-- requiring only a new head.
-Quarrens. Any of them. The Trawler from the first episode, the fishermen from season 2, or the pirate from season 3. I love the species and I'm sad we've gone a decade without seeing them in the 6" line. Definitely low pirority for Hasbro considering their strange, probably company-mandated aversion to background aliens in the Black Series, but I'll keep pushing.
-Frog Lady. Pretty please? She'd be a fun figure, with an incubator and attachable tongue. Probably a never-ever considering that she's 1.) an alien and 2.) would require an entirely new sculpt, and both of those things in the current era seem to be sacreliege.
Other than those, I'd love to actually get some creatures in the 6 inch line again. We have the Wampa, the Dewback, the Tauntaun, and that's been it for awhile. Creatures would be a great way to occupy the hole that the absence of vehicles in 6" leaves, since many of them aren't unreasonably sized. There's no reason for us to have a muddy Mando and no Mudhorn to pair him with, but why stop there? The weird, Phyrexian-looking cyborg from the last episode was amazing, and I'd love to get both it, it's suit, and the blood-trap all in one product. The constant appearances of Banthas in these shows would also be a great opportunity for Hasbro to finally get around to making one in this scale.
Overall, I think Hasbro's done a surprisingly decent job of covering the Mandalorian in the Black Series, but there's always been a few omissions. Usually alien ones.