I'm searching for a cartoon released in the late 2010s. It may have been from a minor streaming service or small TV network. There was at least one season. I don't know if there was a second.
The main character was a middle aged, male 'chosen one' (in the mould of Buffy the Vampire Slayer) selected to fight monsters. He dressed in cheap black suits and was visually past is prime. He wasn't fat. The setting was modern day but with secret monsters - like Supernatural or, again, Buffy.
The cartoon has action heavy, with blood and gore, but I don't think there was any nudity.