Seer of Life
One of the easiest classpect typings. On a literal, surface level, Adelaide reads the code of life as if it were written in a large book, translating and manipulating the information/data that encodes life itself. If Homestuck had obvious references to genetics, Sburb Player Adelaide takes that reference and beats you over the head with it.
The classpect lines up perfectly with her role as a gatherer of knowledge about not just biology, but also life in general, and all its workings--a role she is constantly playing throughout the story. Considering Adelaide's role as a nigh human encyclopedia, it is obvious to me that she would be one of the knowledge classes. She's in no way an active player, with a personality that barely acknowledges the existence of her self, let alone seeks selfish benefit. Her powers are almost designed specifically never to be actively weaponised, working best slowly and on a large scale.