I wanted to become human because I wanted friends. Now I want to become a monster to help Luffy!
I believe “不屈の双璧” means something like “The unrelenting, matchless duo,” and the silhouette in Hangeki no Tsubasa indicates that it’s Levi and Hanji this time!
(I’m going by a Chinese character translation, so the kanji interpretation might be somewhat different!)
Don’t worry—that’s what it means in Japanese kanji, too. c:
Thank you for confirming! ;) <3