iserith
Magic Wordsmith
The limits on Otto's intelligence, beliefs and actions where there prior to any establishment by the players and had ZERO to do with any int modifier.
What rules-mandated limits are there on beliefs and actions due to having an Intelligence score of 5? The rules do say that roleplaying is the player determining how the character acts and thinks (Basic Rules, page 66). I can't find any rules that support your position.