The written form of Irken consists of a series of indistinguishable characters in the show. The show's creator had no Irken character chart in mind when he had Irken letters appear on screens and the opening sequence of the show. The Irken subtitles on the DVD and the show itself had totally different characters. The ones on the subtitles consist of the first 20 letters of the alphabet (A-T). The rest of the letters have apparently not been developed, leading to controversy as to whether it is the true language at all; it is, however, possible that the remaining sounds (U, V, W, X, Y, and Z) either do not exist, or do not need separate letters in their alphabet, as most of their sounds can be achieved with other letters. Because there is no letter for Z, the main character's name is spelle