First, make sure you know who's included and what's the order the categories. This will first help you track down the type of animation you're after: Enemy, NPC, location, etc.

The Characters page isn't ordered the same way the Gallery is, but this page does have the order in which you'll come across them. This way, you can see if you missed a character's specific location, for example, if you Brask, continued exploring, then found Dan, you'll know that the character you're missing may be between this two characters' locations. The same is true for enemies, found in the same page, and Locations

Keep in mind that from the characters page, those found in the Affiliation Unknown section and Lin don't have animations you can log in the Gallery

If you're still struggling, you may check below…

The player can choose to temporarily unlock everything in the gallery for quick viewing, this was introduced in version 0.20.400. To input it, the player will need to hold down Cheat control 1 and 2, then press Cheat control 3 three times.

With default bindings, the Cheat controls inputs are as follows:

For mobile devices with touch input or by using the mouse, the cheat code can also be activated by clicking/tapping the white gradient near the bottom center of the screen three times within two seconds.

The player will know the cheat code worked because a sound effect will play, every animation will be unlocked and the game will call out the player above the Gallery completion percentage, which should be 100%. The gallery will have all the animations unlocked until the player backs out to the main menu.

For a permanent solution, you can unlock the gallery by importing a custom Gallery file (GalleryData.es3) that modifies the gallery's saved data.

In the gallery I'm missing a character between Brask and Jack. Who is it and where are they?

The answer can be found in Brask's Palace. You can use the teleporter to travel here more quickly.

Continue to the right side of the map, past Brask, jumping and punching to clear a path to ??? (Leon).

In the gallery I'm missing a couple characters after Octo. Who are they and where can I find them?

The first can be found in the Forbidden Bayou. Continue to the far right side of this map to find Liath.

The second can be found in Ali's Surf Shack. Teleport back to Sheo Islands Beach and enter Ali's place to find Kaylee.

The Sheo Islands Beach location has an NSP animation on top of the Game Over one. How can I get it?

After reaching Smol Beach and returning to the Sheo Islands Beach, you'll find Ket on the third lifeguard chair (from west to east), talking to him will catch him up with your progress and he'll give you a hint on how to unlock an extra spicy scene with him.

I don't get his hint, tell me what to do Head back to the beginning of the location, where you started the game all the way to the west in front of Ali's Surf shack, you'll find a beach ball there that you'll need to kick all the way to Ket's location in the third lifeguard chair. Good luck! Your slide ability will help you with this!