Before I forget: Your postcard from the Lüneburg heath has arrived, thank you!
I suspect the change from Charly to Lotte as a nickname was done because many people of the potential audience would have been unaware that English-sounding nicknames were not only possible but actually a big thing in 1920s Germany, and Lotte struck Twyker (or his scriptwriters) as a more plausible nickname. The change of secondary profession, otoh, is blatantly owed to the (visual) medium, and no, I don't mean nude scenes (she's fully clothed through 99% of the series), I mean dance scenes; Gereon, too, turns out to be a secretly good dancer, and his sister-in-law/secret lover, played by Hannah Herzsprung, has a dream which allows her a dance sequence as well (which reminded me weirdly of the Anya and Xander sequence in Once More With Feeling). In conclusion, Twyker really likes dance sequences in between the serious stuff.
TV!Charlotte's big ambition being to be a police detective instead of being a lawyer has the advantage of tying her directly into the investigations in a "here she proves that she can do it" manner; not having read the novel yet, I don't know how her legal expertise is used there, but I suspect it's in a way that would be more time consuming on screen? But it's all guess work on my part as to why the change.
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I suspect the change from Charly to Lotte as a nickname was done because many people of the potential audience would have been unaware that English-sounding nicknames were not only possible but actually a big thing in 1920s Germany, and Lotte struck Twyker (or his scriptwriters) as a more plausible nickname. The change of secondary profession, otoh, is blatantly owed to the (visual) medium, and no, I don't mean nude scenes (she's fully clothed through 99% of the series), I mean dance scenes; Gereon, too, turns out to be a secretly good dancer, and his sister-in-law/secret lover, played by Hannah Herzsprung, has a dream which allows her a dance sequence as well (which reminded me weirdly of the Anya and Xander sequence in Once More With Feeling). In conclusion, Twyker really likes dance sequences in between the serious stuff.
TV!Charlotte's big ambition being to be a police detective instead of being a lawyer has the advantage of tying her directly into the investigations in a "here she proves that she can do it" manner; not having read the novel yet, I don't know how her legal expertise is used there, but I suspect it's in a way that would be more time consuming on screen? But it's all guess work on my part as to why the change.