Context: Character A, a middle-aged man, suddenly enters the room where Riku, a child, is.
Character A: 何してんだ？リク
Then, in the next balloon (it's a manga), Riku explains what he was doing.
What is いつもの in the sentence above? Is it an adjective? If so would the translation be "oh, the usual man/the man that always comes here"? Or is it the object of the implicit sentence "(I'm doing) the usual, old man"? I would say it is an adjective, because if it was the object it would be いつものを", right? Thank you for your help!