User blog comment:B214/Volume 23 discussion blog/@comment-201.19.100.21-20170409030136/@comment-31137559-20170409232901

Besides their appearances being similar, they are nothing alike. Mio is nothing like Rias in personality. Basara is nothing like Issei in personality. And Maria is definitely nothing like Koneko in personality.

And Rias does have some remarkable lineage with her mother being from the House of Bael. But I don't consider Sirzechs becoming Maou part of being of remarkable lineage. He's her brother and did that with his own ability. That was a title granted to him. If her father had become Maou then you would be right. But Rias' lineage is no more special than the other pureblood high-class devils from noble families.