Merry

Merry is Kaya's loyal servant, and was the one who designed the Going Merry.

Appearance
Merry is a tall formally dressed butler whose most distinguishing feature is his lamb themed appearance. His hair is curly like a lamb's fleece and has two lamb horns sticking out of it. His lips also resemble that of a lamb's.

Relationships
Merry is a very dutiful and empathetic servant to his mistress, willing to fight and even die for her.

At first, he is very antagonistic towards Usopp, who would constantly jump over the fence and hedges of Kaya's mansion and tell her eccentric stories as he felt that his lies would somehow corrupt Kaya. Despite this dislike for the boy, he never hurt him as he knew the tragic story of why Usopp is such a chronic liar. The reason being because it's the only thing that helps him cope with the death of his mother who he tried to save from her sickness by lying that his father, Yasopp had returned to be with his family.

History
When Kurahadol, another servant of Kaya's who she confided in turned out to be the evil pirate captain Kuro in disguise, Usopp tried to warn Merry and Kaya, but their combined faith in Kurahadol made them believe that this was one of Usopp's lies but such an offensive one that neither wanted to deal with him again, so Kaya did not interfere when Merry tried to violently force Usopp off the property.

However, Kuro soon began his long-set plan of assassinating Kaya and taking her fortune and Merry was unable to protect her, his devotion not enough to conquer Kuro's skill and blood thirst. However, Usopp managed to convince Straw Hat Luffy and his crew to intervene and Luffy defeats Kuro.

Merry, feeling guilty because he now realized Usopp cared so much for Kaya tells her the story of why he lies so much, she is shocked and touched by it. As a reward to the Straw Hats, Kaya and Merry give them a ship- the Going Merry, a caravel that Merry had designed himself. Usopp joins with the crew and leaves with them, Merry becomes Kaya's new confidant. He is now helping her achieve her dream of becoming a doctor so that she can help people like Usopp.

Trivia

 * Merry's appearance and name is a reference to the nursery rhyme "Mary Had a Little Lamb".