Yelena Klimanov is a minor character in The Batman.
She only appears in the season 1 episode "Q&A" and she is voiced by Kath Soucie. She was a contestant of the show "Think Thank Thunk" and she was competing with Arthur Brown. Arthur lost the game and fell into a revenge driven depression while she became a chess champion.
She was later captured by him, after her humiliation in public. Along with Ross Darren and Herbert Ziegler, she was later saved by Batman.