In Japanese, you can use “nanika” and “dareka” to ask about something and someone, respectively. These expressions mean “something” and “someone,” and they are used when you want to inquire or refer to an unspecified thing or person. 

On the other hand, “nanimo” and “daremo” are used with negatives to indicate “nothing” and “nobody” or “no one.” These expressions emphasize the absence or non-existence of something or someone in a statement.