C83, of those words that Swell cited, two are negative words: "pauper" and "naughty".
That word for "genius" uses the character for ghost because, if you check the etymology, it can be traced back to being coined for a particular writer/poet from the Tang Dynasty who write dark, scary, upsetting poems/stories.
With regards to the characters for hilarious ... the original is 扮鬼扮馬 ("pretend to be a ghost and a horse") but two characters were later removed, leaving us with 鬼馬 as "funny and hilarious" ... but the meaning is closer to "tricky"/"sneaky"/"crafty" ... which also has a negative connotation.
You've given me two negative words and the others turn out to really be linked to ghost as in ghost. One of those relatively benign words is still a bit negative.
What you're doing is not too far off someone quoting someone else citing the word "n*ggardly" as evidence that "n*gger" isn't a slur.