William Andrew Solace is a sixteen year old[1] Greek demigod, the son of Apollo and Naomi Solace. He is the current head counselor of Apollo's Cabin and a prominent healer at Camp Half-Blood. Will is currently the boyfriend of Nico di Angelo.

Will lent Annabeth his chariot from his cabin to borrow, and was very upset when it crashed in the lake. Will yelled at Annabeth, and said she could borrow it, not destroy it, and Annabeth apologized and promised to get it fixed. Will scowled at the chariot. Will also questioned why Leo, Piper, and Jason weren't claimed yet, since they looked way older than thirteen. Before Annabeth could explain, he asked if there was any sign of Percy, and Annabeth said no. After Leo was claimed, at Annabeth's request, Will took Leo to Hephaestus' Cabin to meet his bunk mates and give him a tour of Camp Half-Blood. Will said sure, and put a hand on Leo's shoulder as he walked him to the cabin, promising to explain everything.

Will took Leo on a tour of the camp, which impressed Leo, who thought that Will was cool. Leo asked if he would get a sword, Will winced as if he found the notion disturbing, and Will said he would probably make his own in Cabin 9. Will also explained who his dad was, and how his name is Hephaestus, not Vulcan, and that it was good that he was claimed almost immediately. He began to mention a curse but stopped himself, making Leo worry. Will became concerned when Leo thought he saw Tía Callida, and Will said that he had a long day and the Mist was playing with his head.

After the Winter Solstice, Will attended a council meeting as a Head Counselor, absently wrapping and unwrapping an ace bandage around his wrist.