With seven character packs and over 300 playable minifigures in the base game of LEGO Star Wars: The Skywalker Saga, there are plenty of characters who have been confirmed as playable in the DLC, though some are notably missing from the additional content.
1 – L3-37
2 – Omega
Omega is missing from The Bad Batch Character Pack, with the other five members of the team represented in both the DLC and as physical minifigures in 75314 The Bad Batch Attack Shuttle. The lack of an Omega minifigure may be the reason for the character being missing from the DLC, though TT Games has likely created at least a few new digital minifigures for the game.
3 – Dark Trooper
The first minifigure for the robotic troopers appeared in 75315 Imperial Light Cruiser from 2021, though are still not present in The Mandalorian Season 2 Character Pack. It could be that they are present in the base game, though this has not been confirmed.
4 – Playable Grogu
Technically this character is in LEGO Star Wars: The Skywalker Saga’s DLC as part of the first The Mandalorian character pack. However, Grogu is only a companion to Din Djarin and not playable separately.
The reason for that is unclear, though an official screenshot reveals that he rides in the hover-pram, suggesting that movement wasn’t the issue. Unfortunately, you won’t be able to directly play as Grogu in LEGO Star Wars: The Skywalker Saga, but the cute character is still included in the game.