So uh, a bit of a dark headcannon for Morro and his death, but you know how his bones were found by the ninja in the Caves of Despair? This would mean that Morro didn’t die from lava, cause his clothes and hair would’ve burnt off (his bones would’ve remained, cause they apparently can’t burn).
So…does that mean Morro, a teenager whose oldest assumed age is only twenty, was stuck in a cave all by himself as he slowly starved to death? From my small google search, it can take a while (a month, or 8-12 week for it to be fatal) to actually starve to death.
So, this may or may not explain why he was a tad bit insane as a ghost.
Lets make it worse and assume that he most likely started screaming for Wu when he was in pain from hunger. But no one could hear him cause he was so far into the caves. This most likely would also be a good reason why he hated Wu so much during the possession season, and why when Wu was so desperate to save him, he finally got his sanity back.