Chimney is the grandson of Kokoro's most hyperactive grandmother, whose father is currently unknown. He is the owner of a cat named Gonbe (even though he is a rabbit). He appeared in all CP9 Arc.
Appearance
Chimney is a vibrant young girl. He was seen wearing hair ponytail always looking upright, and also wearing short white sandals and shirts with a striped dress top. The color of the scheme from the manga and anime is only slightly different. After Time Skip, he looks a little tall and now he wears a dress like a conductor's clothes, with a big hat like Kokoro, Mentel covering his shoulders, Gloves and Whistle that he always carries. Personality
Chimney is a cheerful girl, like her grandmother. Chimney always (almost) looks smiling broadly, cheerfully and always wants to know what is happening. He is usually not with anyone, he likes to be alone to play with Gonbe.
Chimney is the grandson of a Mermaid (Kokoro) who married an ordinary human. Kokoro has a 1/2 son Dugong who is married to a human, and as a result Chimney only has yung mermaid blood and manusia human blood. Although he did not inherit his grandmother's body shape, he was a very reliable swimmer. He became a strong character, as he saw only a small nosebleed, even though Rocket Man crashed hard on the bridge of Enies Lobby. He also has very good eyesight, the proof is that he can see Luffy being trapped between two buildings at night in Water Seven. He also saw Luffy climbing the Courthouse while at Enies Lobby. And it should be noted, in both situations, Chimney was in a far enough place.
History
Water seven
He immediately liked the Straw Hat Pirates when he first met at the Transit Station. He and Gonbe accompanied his grandmother to Water Seven when he saw Aqua Laguna coming. Then he appeared again when Franky went to Blueno's Bar to buy Cola.
Enies Lobby
He and Gonbe sneak into the Protoptipe Sea Train, RocketMan. He was with the Straw Hat Pirates, the Franky Family, and Galley-La Overseers going to Enies Lobby. Chimney then followed Rob Lucci, Spandam and Nico Robin so he knew the way they were going, he also painted on the wall so the straw hat crew could follow him. He also found the door that Rob Lucci, Spandam and Robin passed, then told Luffyt the door, and Luffy managed to destroy the door and go find Robin. Rob Lucci revealed that he knew that Chimney and Gonbe were following them, but he chose not to say anything, because he was not instructed to watch around and report it to Spandam.
After that Luffy confronts Lucci, while Chimney and Gonbe walk through a secret tunnel with Kokorodan and other members of the Straw Hat Crew. But unfortunately there was a flood as they passed the tunnel, and finally Kokoro revealed the shape of the mermaid and took them through the tunnel and landed on the Government Ship which had been taken over by Franky and Nico Robin. Chimney, Gonb] and Kokoro only saw the Straw Hat Crew fight the Navy, when the Navy realized that the pirates intended to run away on a government ship. Eventually they took out a warship and destroyed the boat that was being boarded, but fortunately Sanji came and saved Chimney, Kokoro and Gonbe. After the Navy managed to surround the Straw Hat Crew. But they heard Merry's voice and finally they jumped towards the ship that turned out to be the Going Merry, they survived and left Enies Lobby safely.
After Enies Lobby
Chimney and the Straw Hat Crew then returned to Water 7, He was always with members of the Straw Hat Crew at Galley-la Headquarters. When Deputy Admiral Garp arrived to see Luffy, Chimney looked very surprised that Luffy was his grandson (Garp). And what is even more surprising is that Luffy is Monkey D. Dragon's son. Chimney and Gonbe swim in the pool while waiting for Nami to tap into Luffy and Coby's conversation. Meanwhile Franky, Iceburg and Galley-la completed the construction of the Thousand Sunny. Chimney, Gonbe and Kokoro saw the Straw Hat Crew towards their new adventure with Franky as their new Crew.
Where is he now ?
Chimney, Gonbe, and Kokoro were later seen at the Sea train station, having fun with Yokozuna because he didn't fight with the Sea train anymore.
Two years later
After the timeskip, Chimney had grown taller and he had become the station head.
Source : WIKIA ONE PIECE