In the book I'm reading, the main character speaks using katanaka in suffixes, part of the words and some particles, like:
待ってくだサイ
ぶつかりマス
どうしてでカ?
どうして、ロボットの修理しないんでしょうカ?
I know katakana is also used for emphasis, but I'm not sure how I should understand that: is the character stressing more that part of the word? Is it just a graphical tool to give her character? Is it meant to be a defect in how she speaks, and if so how would that sound aloud?
As context, the character is a robot: at the start of the book she is a very high-specs robot, literally better than what you can find in commerce, but at some point she ends up in an old model body, while keeping her high-specs mental circuitry. Before that change, she speaks normally; after, she starts with katakana.