if you are a law unto yourself, you do things differently to other people and ignore the usual rules.
Charles certainly doesn't stick to the standard company procedures, but then, he's a law unto himself.
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be a law unto (oneself)
To do whatever one desires and/or ignore rules and regulations. If you need to delegate, I wouldn't ask Gina—she is a law unto herself, and it's hard to persuade her to do anything she's not interested in.How many times has Jason been arrested now? Geez, he sure is a law unto himself!
be a law unto yourself
behave in a manner that is not conventional or predictable.