Z is Caine for obvious reasons. Q is Bubble because he's roundish. F is Gangle because of L's bullying toward him. G is Zooble because not only did he die in episode 5 of Number Lore, in his debut episode, F tripped on him. A is Kinger because he's the first letter in the alphabet, referencing that Kinger has been in the circus for the longest, according to Jax. P is Ragatha because she's nice. L is Jax because he's a bully to F. H is Kaufmo because he died as a lowercase letter, referencing Kaufmo's abstraction. N is Pomni because he was the main character in the original AL. X and Y are the Moon and Sun because they're variables. 1, 2, and 3 are Gummigoo, Max, and Chad because they came from another planet, like how Gummigoo, Max, and Chad are NPCs not in the circus.
Credit to everyone, especially GLITCH for TADC and Mike Salcedo for Alphabet Lore.