"Dick is her best friend and her brother and if anything, Donna is protective of her little brother. That's all I'll say," Leslie told ComicBook.com "I think we know from the comics Kory and Donna have such an incredible friendship and we'll see where that goes in our show. I think what it is is that there's a lot of material on these characters that are established, and we have to get them to that place."
"Our first season I think is being spent, almost adding a back story. It's almost like our season [created] a scenario to get us and our characters to the place we know them as. That's why everyone's not suited up on day one," Leslie said. "That's why not every romantic interest is easy, play-by-play [from] the comics, cause its 2018 and you have to get them there. So Donna and Kory interact and we'll see that, but it's not a triangle. Dick is her best friend, brother, and Kory is the girl he's currently seeing. It's that story."
https://comicbook.com/dc/2018/11/30/...love-triangle/