A ruthless if dishonest businessman, megalomaniac, narcissist, white supremacist, immoral, chronic liar, somewhere on the autistic spectrum, lacking in empathy, sympathy, poor understanding of social relations and politics. He's completely untrustworthy in my opinion, and I certainly don't want him running the country.
Seth Abramson is writing a biography of him. He has loads of material about Elon on his substack (some of is free, enough to get the gist, the rest behind a paywall). Musk comes across as the kind of evil genius you see in James Bond movies but hope you'll never encounter in real life.
https://sethabramson.substack.com/p/the-truth-about-musk-from-his-biographer