First - The rabbit, found on any grass block (light green) in the outside.
Second - The wolf, found in forest blocks (dark green) in the outside.
Third - The kobold, found in swamp blocks (very dark green) in the outside.
Fourth - The shark, found in ocean blocks (blue) in the outside
Fifth - The fox, found on beach blocks (yellow) in the outside.
Sixth - The sheepccubus, found in a purple sarcophagus in drill mode on the snowy mountain blocks (white).
Seventh - The snake, found in drill mode on a block with a transparent ? on mountain blocks (brown) (you will have to fight the snake,preferably equip the red bow for x100 damage).
Eighth - The dragon, found at the end of the drill mode in the lava block with a hole (red) the hole will be seen once you access the lava blocks, (you will have to fight the dragon, preferably equip the red bow for x100 damage).
Ninth - Naav the robot, you find the plans of her body in the snowy forest area (white with mostly gray), you will need 999 of the three stones in the game I think (preferably use the cheat code ↑↑↓↓←→←→ in main rooms for 1 million of all materials).
Tenth - You, because you are a character (technically) and you are the HOLE DWELLER (insert music from that fucking meme).
((PS: I think there is also one for just the pattern version players))