I like chainsaw man. Some other shounen, while they do have fanservice it serves as cheeky guilty pleasure moments, and the horny characters are sidekick butt monkeys.
In Chainsaw an that horny sidekick butt monkey is your main character, and the reader kinda has to be somewhat down bad in order to fully appreciate it, and there is no pretense in it.
But It’s not an ecchi series. The fanservice in Chainsaw Man, if there is any, is barely titillating. It’s weird, it’s raw, it’s awkward, it rarely meets your expectation.