Is there lots of romance in this?
In my opinion, the romance in this is subtle but you can definitely sort of tell its there .
There's hints of it through out.
I hope this was helpful (=・ω・=)
Well, there are a lot of implications. In the later chapters, there is a spike of jokes and gags on the topic. Those are usually kept short. However, it is a very good manga overall. As long as you don't have a phobia of sexual/adult themes and jokes (Usually done obviously but not irritatingly -As a woman I think it's okay) you should have a good time with this Manga.
If you are, however bothered strongly by those things then there is another one: "I reincarnated as a slime" (or something like that) that tones down the fan service and jokes along those lines quite a bit. It's definitely there, but it is done a bit better.
Sorry for long reply, and keep in mind I am simply a fan of manga and not a critic or reviewer in any form. Merely trying to help.
Is there any other mangas with a twisted male Lead like this one?
Tomodachi game! It's just a great manga oml
I'm the beginning he's very "innocent" but he's actually crazy.
Maybe try Arifureta Shokugyou de Sekai Saikyou? I don't know if he's as twisted as the MC in this manga but it's about him getting revenge on his classmates who betrayed him.
I think Nidome no Yuusha is the closest that I've read. It's violent and it's about the MC getting revenge on the heroine and others that betrayed him.
Is there any romance and or harem in this if so I am going to pass on this one
No
yes
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Absolutely I tried reading the light novel & it got on my nerves .mc is a serious skirt chaser , he runs after every beautiful girl he see plus I am not comfortable with the fact how he sexually looks at his step sister xan xia plus touching her butt & all ...at the same time claiming Mu Ning Xue to be his too ..thanks heaven that she is not much of a pushover & docile like can xia ...Moreover i read nearly 600 chapters but he had no character development ..