A: The same. B: The same but doesn't get wounded. C: The same but doesn't die. D: The same but doesn't get kidnapped. E: The same but doesn't get kidnapped. F: The same but doesn't die. He tries to spell "FF" (short for friend forever). G: The same. H: The same as Dutch but gets covered in goop. I: A bully with the design of @AlfabetonsOfficial's Portuguese Y. Like the other bullies, she doesn't leave the group. Owns the slash gem. J: Equivalent of LHDA N. K: Equivalent of ALBTWIAIOF R but loses his gem in episode Z after getting taken by F's goop. L: Equivalent of LHDA Ñ but doesn't die. Owns the tilde gem. M: The same. N: Equivalent of L but doesn't leave the group. O: The same but doesn't leave the group. P: The same but doesn't die. Q: The same as @wario100's LHDA version of ALBTWIAIOF version 2 but doesn't get wounded. R: A bully with the design of @AlfabetonsOfficial's Greek Ξ but doesn't leave the group. Owns the hyphen gem. S: The same as ALBTWIAIOF but doesn't die. T: The same but gets freed and joins the group. U: The same. V: The same but doesn't leave the group. W: The same as LHDA but doesn't leave the group. X: The same but fully lavender and doesn't die. He also gets covered in goop. Y: The same but fully yellow and gets covered in goop. Z: Y's brother who has a similar relationship with X to what G and S have. He comforts X and Y after X loses his gem, and also gets covered in goop. There is no Q equivalent because F cries the question mark gem in his cave and puts it in a chest, which he opens after freeing the other letters from his goop. There is no W equivalent because there is no N equivalent, and therefore no nightmare. There is still a coward equivalent, that is shown in the flashback. There is no Z equivalent because the letters live on a normal spherical planet. In the epilogue, titled "Next Time Won't You Sing With Me" due to the flashback episode being "Now I Know My ABC's", there is no gem to reverse time or heal everyone because everyone is already okay (minus the goop, which F just licks off). I will explain why there is no N equivalent inside this project.
Credit to everyone, especially @AlfabetonsOfficial for the bases of H, I, J, R, and W, @wario100 for the bases of K, L, N, Q, S, X, Y, and Z, @PhonicLover44 for the sprites, and Mike Salcedo for Alphabet Lore.
