People are all different. We all look different, behave differently and think differently from one another.
We are all different in appearances, behaviors and opinions.
People are different from each other in appearances, behaviors and opinions.
different「違う」
difference 「違い」
differently「違う風に」
スッキリした言い方がいいと思ったのでこの回答にしました。
People are all different. 「人は皆違う」
We look different 「私たちは違う風に見える」（見た目が皆違う）
We are all different in appearances, behaviors and opinions.
「私たちは見た目、行い、意見に置いて皆違う」
日本 
