Regarding / As for
Used to introduce a topic or subject that has a specific context or emphasis, usually in spoken or informal situations.
Examples
彼ときたら、いつも遅刻してくる。
As for him, he is always late.
この問題ときたら、答えが難しすぎる。
Regarding this problem, the answer is too difficult.
学生ときたら、勉強ばかりしているわけではない。
As for students, they are not just studying all the time.
Quick check
彼___、いつも遅刻してくる。