Mary Gowland carries a light string instrument with him and insists on playing it, to the horror of everyone around. Gowland hates Blood because Blood told everyone his real name. He also dislikes Boris for dripping blood on the floor. He is good friends with Boris and Julius Monrey and is often very laid back.
He loves music even though he can't play music to save his life. His name is supposed to be a pun off of 'Merry-go-round' since the engrish pronunciation of his name is 'Mary Gowrand'. This is why he didn't want anyone to know his first name and is preferably called 'Gowland'. He's based on the Duchess in Alice in Wonderland. [Source: wikia]
You can download this papercraft toy here: Heart no Kuni no Alice - Chibi Mary Gowland Free Paper Toy Download [Instruction]