DLANOR! BEST GIRL! MY BABY INFANT CHILD! I love her a lot, if you couldn't tell. I like her less than Beato and Erika but she's still best girl. She's so smol. Also her name is Ronald backwards, like Ronald Knox.
Okay so to explain how Dlanor speaks. To quote someone in my Discord server: "Dlanor ends all of her lines with words written in katakana, the Japanese alphabet used for foreign loanwords. These words however are not words that are normally written in katakana, but are just written as such for Dlanor's lines. Witch Hunt decided to capitalize these last words following the same convention they did for witch names (which are also given in katakana--EVA instead of Eva for example). In addition, during the FINISHED sequence, the word she uses is desu, which normally has a grammatical function. When written in katakana however, it can be read as "Death". So that sequence is basically based around a pun that transitions to her "Die the Death" thing. In the official manga, this is translated as "searched and VOIDED", with the "-DED" ending gradually becoming "DEAD" and then "DEATH"". So basically, she capitalizes the last word of a given sentence.
The thing about Erika is she is immensely arrogant and, while she is also smart enough to actually back up that arrogance, she's very narrow-minded. She refuses to see past a conclusion she's already made because in her mind, she's second only to Bern in how infallible she is. She's the Detective, the Detective isn't WRONG, that doesn't happen. And don't worry about bullying her too much, she deserves it, that's why Bern does it all the time
Something that makes me very sad about Erika is that I will never find another character who is quite like her. People don't really make characters like Erika, and that's very sad because Erika is just the perfect storm. I love her so god damn much. She's the absolute worst and I adore it.