The symbol on the back of both Gackpo's fan and shirt/jacket is a stylized version of the kanji character for 'music' (楽). The colors were picked to make him stand out from the other VOCALOIDs. When considering the features of Gackpo, the producers informed the designers that they wanted the eyes to look like Gackt's and for his outfit to include a combination of cyber and traditional Japanese-styled clothing. The sword exists because producers wanted a link to a musical instrument and there were no objections to the use of a weapon. The patterns on its blade make musical sounds when it is swung down.

Gackpo has a samurai aesthetic: the VOCALOID is clad in a Jinbaori, a kind of kimono which was used as a battle surcoat, with parts of Japanese armor, and carries a katana which is named 'Music katana, Miburi' (楽刀・美振 / Gakutou Miburi). An eggplant with stick-legs is an additional item included with his Nendoroid figurine. In keeping with the Item Wars, Gackpo has been associated with eggplants. Gackpo is one of the few VOCALOIDs to see his most popular meme make it into merchandise form. Gackpo's look was picked from several possible designs. From this concept, Internet co., Ltd drew up their own ideas on what makes VOCALOID popular. A note from Crypton Future Media's VOCALOIDs stated that they were using cyber-style clothes which can 'melt into' our everyday lives as much as possible. The avatar of the software was drawn by the illustrator Kentaro Miura (三浦健太郎 Miura Kentaro). The same issue occurs with GUMI and her software Megpoid. This is owed to the confusion over the separate name for both the VOCALOID and software package. Less experienced overseas fans mislabeled Gackpo as a 'Gackpoid' rather than a 'VOCALOID' and sometimes dismissed that he is a VOCALOID altogether. Other spellings of his name have also been witnessed from other sources. 'Kamui Gakupo' can also be seen on the KARENT website. 'Kamui Gakupo' is the spelling overseas VOCALOIDs fans are accustomed to and frequently use. The romanization of his name is 'Kamui Gakupo' (かむいがくぽ) but is officially stylized by Internet Co. Consequently, the full implied name of this product is 'Gackt-like VOCALOID'. The 'poid' on the end of the name is short for 'like VOCALOID'. The software name of 'Gackpoid' also takes its name from Gackt's own. 'Gackpo' is based on the pronunciation of the name 'Gackt'.

List of male vocaloids