Total Recommendations: 4
These two titles share not only some psychological themes (identity complex, definition of humanity, communication and relationships, courage/fear, self-realization/suppression etc.), but I also find the art style quite similar. I can even find some resemblance of characters, where as Key alias Tokiko Mima shares the same behavioral archetype as Rei and Sakura Kuriyagawa reminds me of Misato.
Another two titles that share similar psychological themes, ideas about reality, existence, soul, identity and humanity and its' connection to modern society relationships and technology. Looks like Key is the predecessor to all anime that raise spiritual queries. Oh, and you can see how some scenes from Key (for example the doll creating scenes in the OP) were used in GitS too.
These two titles share psychological themes, ideas about reality, existence, soul, identity and humanity and its' connection to modern society and technology. Looks like Key is the predecessor to all anime that raise spiritual queries.
Valkyria Chronicles also seems like a war and love story and comedy all rolled into one like Toshokan Sensou. These shows have a similar military and comedy feeling. And Inoue Marina is the voice actress of both main protagonists, Kasahara Iku and Melchiott Alicia. Both of them are kinda tsundere and tomboyish, although Alicia looks little bit more feminine. Even other characters of these shows may have common attributes.