For Seraphina I think I would just have to go "Disney anthropomorphic animated film core but with much darker themes and heavier materials" and for Lazarus, I'd probably explain it as... like... "Vampire guy who was outcast for being a vampire despite being very kind meets a very Merida-esque girlie and falls in love while also having his past come back to physically haunt him."

It's a little hard to explain things so simply bc of how much I have for their stories but its the best I could think of.