X: Equivalent of Aircat's Dutch V, except that there is a different reason for why she gets kidnapped: despite not being in "AMIKOJ", she is kidnapped by A, who holds her hostage in the lair. O then gets into the part of the lair with A and the kidnapped letters, and he sees the kidnapped M, I, K, and J, along with kidnapped X. A then threatens O that if he doesn't stand between K and J, then she will rip X apart into pieces. However, O, having found his courage, doesn't listen to the threat and collects the semicolon gem before turning into a megahero, and he shoots the rainbow laser at A just as she is about to kill X. Don't worry though, after the rainbow laser disappears and O turns back to normal, he frees her.
I added X in my Esperanto Lore, due to the "x-system" used for typing in that language. However, due to X not being part of the Esperanto alphabet, she won't have her own episode, instead debuting in episode V. She can also speak Esperanto fluently (very surprising for a letter that isn't used in the alphabet of said language). @AlfabetonsOfficial for Dutch V @AlfabetoLoreSerie for Dutch V with X's shape
