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Looker is just such a goofy, lovable character. I love how he is able to mesh in so well with the world of Pokemon, given his silliness. He always brings a smile to my face, from his exuberant attitude to his theme popping in every now and then.
What's more, I love how they expanded his character arc in XY, giving him actual depth with Emma beyond being a silly Interpol officer. That, and his Croagunk's death. I think GF handles his character excellently.
The whole timeline theme he has with being an absolute mystery of a person is my favourite thing about him, though. What was he doing on the SS Anne? Why did he wash up on shore in ORAS? How did Croagunk die?
There are just so many great questions to his character.