Mushoku Tensei is a good example of the BP and lookism, specifically regarding the protagonist, Rudeus, who used to be a Sub-Five, fatcel, glassescel, ricecel, hikikomori NEET who died because he was kicked out after masturbating in his room while his parents' funeral occurred, with his family keeping him out afterward as he died sacrificing himself saving some teens from a truck.
Afterward, he's born in a well-off European mogger family to Chad and Stacy dad and mom, with him becoming a European mogger himself, blessed not just with looks, memories of his past, wealth, and social status, but also with magic as he's a prodigy.
Lookism is seen regarding his Chad father, who cheated on his mother with their attractive Stacy maid, making her pregnant, but was forgiven regardless, along with the maid, as they kept her and raised her child as Rudeus' half sister.
And the memories of Rudeus's past when he was bullied in school due to his ugliness play a role in his current life as he has a tough time socializing with the local children and keeps his perverted behavior and instincts, much to the dismay of his maid and his beautiful, petite magic teacher, Roxy.
But the BP also factors in a meta commentary as people in the real world have a problem with Rudeus having sex with Eris Greyrat and taking her virginity away, despite them being both the same age physically and her being attracted to him, because of his previous appearance and "age", when the latter is a nonfactor in truth. All that matters is that some Sub-Five male, now in a mogger body, is getting prime JB pussy, and people are upset about it.
