Just realized King by Lauren Aquilina fits Shiro so well! How did I not notice this? I've been watching the show and I've heard this song multiple times for two to three years! It's my third favourite song!
Maureen Shadow Is about a group of space pilots - Shiro, Keith, Lance, Pidge, and Hunk who immediately get swept up into the Galran War. They meet Princess Allura, become Paladins, and reunite the five lions to form Voltron to combat Emperor Zarkon's nefarious schemes, with the hopes of ultimately defeating the entire Galra Empire and save the whole Universe .