Hi~~~
Well, if you still asking about Male Protagonist,
Male Protagonist with No CP will be found soo many, meanwhile the other is ML with Harem is also soo many(which is um somehow I don't like, it's weird tho when female like reverse harem sometimes lol) but I read those one or two if the women just background for them getting stronger. But... If you talked about romance/BG even Era, moreover Male Protagonist? I think it's very rare, I found them one or two long ago from summary (I forgot where, bc I'm not interested to read those at that time).
Meanwhile me, hehe, the other way Around, I'm searching for Female Protagonist with No CP (I'm lil bored from romance) with adventure and they got power from being weak to strong, I found it's very rare, mostly just Male Protagonist. I get it most female readers like romance, but, I dunno why writers seldom make those FP focus with getting stronger without CP, think I read too many romance that's why I'm full lol, that's the reason why it's very rare to found FL No CP from weak to strong. Well, but I still found one or two, the rest... hmm...at least a lil romance is okay. I'm reading online at 69 shuba tho, and y cn searching some stories from their tags, maybe you can also find what you're searching for someday.
(Sorry, hehe for suddenly rumbling on your message board, I'm just lonely here, seeing your profile's note makes me wants to answer ( ̄∇ ̄)/)