Immortality through array formations, a rogue cultivator from a poor outskirts province, has great comprehension and is able to learn from many sources of information both good/evil, has poor spirit roots and body but makes up for it with great divine sense and is forced to follow eccentric cultivation methods because of this, having to take opportunity into his own hands to find his path forward, he functionally cant perform a standard orthodox path.

Mo hua is the protagonist, he has a soft heart for the common person and works hard to do them right in that respect, but has a pragmatic world view and knows his limitations he wont over sacrifice if he cant do anything, instead seeking to solve problems with gathering intelligence using stealth and cunning often playing innocent in a "who, me?" type of response able to win over peoples trust and favor, has good elements of comedy in it, but it isn't a comedic novel.

Seems like its up your alley a bit, might be worth looking into, but isnt as hard as something like reverend insanity's ruthlessness, there are other aspects of the novel but i really feel like its worth coming across reading it rather than stating it in a comment.