Robot skeleton backstory feels so sad, he was just a meaningless toy soon to be thrown away when loli demon lord got bored, then another demon lord used him as a walking wikipedia but nothing more. When thr demons sacked the place, left him as useless...
Mao unknowingly threw him into treasure room as a useless toy once again.
He has vast knowledge but wasn't granted intelligence, just a pointless toy that records things.
If Mao would give him intelligence, he might just do something bad I believe...