Clara is a Spanish VOCALOID developed and distributed by Voctro Labs, S.L., and was released in December 2011 for the VOCALOID3 engine. She along with Bruno were among the first Spanish voice banks commercially distributed. Her voice provider has never been revealed.
Her initial concept and overall appearance were done by Raimon Benach. When the illustration contest was performed, the Spanish company requested to the participants keep the overall design of the original illustration. Rumple's winning entry was adopted as the new official art.
With the release of the boxed versions, the design had a new revision done by Rumple. The new design had a more daring look, but keeping the previous design. Among the major changes, Clara's shirt now is trasparent, her highlights changed from white to blond, and her body build is less skinny.
Clara and Bruno are aimed at Spanish music professionals and the first VOCALOIDs aimed at Spanish culture. They do not incorporate the moe-esque style of some Japanese VOCALOIDs, their designs are aimed more towards a retrospective Western art style.
Clara and Bruno had a fanart competition. The contest was done in response to the disappointment in the artwork from anime fans. The winners were announced on the 19th of December. Although Voctro-Labs stated at the beginning of the contest they may not adopt the winning piece, Rumple's winning entry became the new official design.
Clara suffered backlash based on her illustration, mainly for lacking an anime-like design or referred to as not having the appearance of a Vocaloid, with some going so far as to label Clara and Bruno as "ugly". However, within the Spanish fandom there have been reports of strong defense from fans of the pair and Vocaloid. However the voice type itself has been said to be appealing in general, despite the issues some fans have had with the boxart.
By March 2012, Bruno and Clara were amongst the least popular of the VOCALOID3 voicebanks; though together they are more popular than Tonio, neither surpassed his popularity when weighed in separately.
The reaction towards the initial artwork may have had a later impact on future VOCALOIDs, and was one of the theories put forward as the reason Yamaha rejected the original non-"anime-esque" design for Avanna.