What's the difference between お調子者 and かっこつけ? Please give me examples.
These are fundamentally different words. A stereotypical ちゃらい person may have both traits, though.
お調子者 refers to a frivolous and talkative person who does not have their own opinion and readily chimes in with others. An お調子者 likes to survive by flattering someone or being flattered by someone.
かっこつけ is someone who tries hard to appear or act cool. It can imply the person is empty inside and does not have an ability that matches their appearance.