It definitely turned me off from the series for the longest time, though I did end up playing CT for the first time this year.
Arakune is inspired by a character from Spirited Away.
Other characters look like they came out from Last Blade. Eg Akari-Platinum. Setsuna-Hakumen. Mukuro-Hazama. Shigen-Tager. Yuki-Tsubaki.
After thinking about it... yeah there are some similarities with Last Blade. I do recall reading about the Hakumen/Last Blade connection somewhere at least.
I actually honest thought of Darkstalkers first, though (speaking only for CT's cast).
-You got a catgirl (Felicia/Taokaka), a vampire (Rachel/Demitri), a werewolf (Talbain/Valkenhayn) and a heavy/large golem who fights with lightning (Victor/Tager).
-Arakune and Carl Clover + Nirvana actually struck me as the concepts of Shadow and Marionette from Darkstalkers but turned into actual fighters. Same with Nu-13 seemingly taking Jedah's aesthetic, but removing the self mutilation and playing up the bladed wings concept by 100%
-Then there are some smaller things, like Litchi's gameplay gimmick reminding me of Donovan with his sword, or Noel with her silly, short ranged guns reminding me of Bulleta's machine gun attacks (which also have hilariously short range normally).
(I don't think Blazblue is unoriginal or derivative but I was not expecting this game to remind me so much of Darkstalkers in certain parts)