Sir Alda-thu, "Thu" for short, is a rock-man, and slope-headed giant from Slope-head Isle. He is among the most educated giants, and is capable of reading Alda-krii, "rock-roar." A wildly off-course boat with Sonn Ekator landed on Slope-head Isle, and Thu volunteered to go with them. He has a relatively rare for giants, desire to explore. He has been paraded about in the Motherlands like some circus animal. He has been knighted" by King Yefres of Alanor.