Wendy&#039;s pet turtle.    While he doesn&#039;t have a speaking role in the main series, he plays a major role in the DVD specials &#039;Gun x Sword-san&#039; where he converses with Wendy and other characters. He has shown to be quite the sophisticated turtle.

Van, a lanky and apathetic swordsman, is on a journey to kill the murderer of his fianc&eacute;. The only characteristic he has to go by is that the murderer has a claw for an arm, hence the murderer being referred to as The Claw Man. During his travels, Van happens to pass through the city of Evergreen, which is defending itself from bandits who aim to rob the city of its treasury. It is in this city that Van meets Wendy Garret, a timid young girl who is looking for her kidnapped brother. When the city pleads for Van's assistance to defend it, he refuses, claiming it has nothing to do with him and thus leaves the city on its own to deal with the peril. Soon after, Van comes across the raiding bandits himself and they eventually tick off the swordsman to a degree where he takes action against them for his own personal vendetta. Surprisingly, Van learns that the bandits had ties with The Claw Man, and in kidnapping Wendy's brother for a reason they did not disclose. After the bandits are dealt with easily, Van and, much to his chagrin, Wendy continue the journey in search of The Claw Man. Little do they know, however, that The Claw Man is involved with something more atrocious than either could fathom. 
[Written by MAL Rewrite]

These are a series of 13 omake episodes of Gun x Sword, tied in very loosely to the plot, with the characters as chibi puppets. The main characters are Wendy and her turtle, Kameo, who is the size of a human in this series and is able to talk. All the episodes seem to center around analysing various events in Gun x Sword and mocking the themes displayed. 
They are included on the DVDs. 
(source: Wikipedia)