Gunship is the primary font used in Code Lyoko. as it is the font used in its title and opening theme. This font is used primarily in the Opening Title Sequence, Tower Interface Codes, the interface in the Celestial Dome, and sometimes the Factory Interface.
In the opening theme in Season 1, the letter d in "Code LYOKO" appeared to be lowercase, as opposed to the rest of the letters. It was probably changed to an uppercase D in Gunship after Season 1 to be consistent with the letters in the words in the Towers.