Can somebody give me BL where the Top is a Sweet Psychopath?

I am not sure what you mean but maybe these?
https://www.mangago.zone/read-manga/mad_dog/

https://www.mangago.zone/read-manga/tell_me_your_wish/

https://www.mangago.zone/read-manga/payback_1/

https://www.mangago.zone/read-manga/the_place_where_the_wind_blows/

https://www.mangago.zone/read-manga/avle/

https://www.mangago.zone/read-manga/hello_im_your_stalker/

https://www.mangago.zone/read-manga/when_the_killer_falls_in_love/

https://www.mangago.zone/read-manga/kansai_jin_to_hukuman_satsujinki/

https://www.mangago.zone/read-manga/love_replica/

https://www.mangago.zone/read-manga/kill_me_if_you_can/

I meant the ML being a Psychopath outside while being sweet to the Uke but thank you