Girls:
#1 - Merlin... I think a lot of people will agree that Merlin is just hot/good looking... there is no two ways about it!
#2 - Matrona... i mean, she is definitely better looking than Diane, because whilst Diane is cute... matrona is hot! Plus the cover page to chapter 155 doesn't help deter how i feel about it
http://www.mymanga.me/manga/Nanatsu_no_Taizai/155/1
Guys:
#1 - Escanor... Because OMG! In the side story he honestly looks like he was meant to be the perfect golden boy everyone wants to go out with in school. He's buff, he's handsome... although his personality does stink
This guy is so hot that some people just can't handle him!
http://www.mymanga.me/manga/Nanatsu_no_Taizai/150/10
#2 - Probably Ban, because other than being half naked most of the time and showing off his abs... he's still pretty hot.
It should come to now surprise but, it seems like we think the characters who have the least amount of clothing on at all times are the hottest for some reason.
Ban and Escanor have gone shirtless for a few chapters, Matrona barely wears much on her body and Merlin wears even less than her.
I wonder why we prefer the people not wearing anything :P