I really like 'Ask the Seven Demigods: Battle of the Titans' fanfic. In this, the seven demigods are in a battle against the resurrected Titans. The author does a great job of portraying the action and the demigods' unique powers. There's also 'Ask the Seven Demigods: The Camp Half - Blood Chronicles' which is more about their daily lives at Camp Half - Blood while answering some strange questions.
Well, 'The Seven Demigods: Answering the Call' is a fanfic that stands out. It delves deep into the personalities of each demigod as they answer various questions from mortals. Also, there's 'Ask the Seven Demigods: Mythical Mysteries' which involves the demigods solving ancient mysteries that are somehow related to the modern world.