Which character had a positive impact on Frenchie's coming-of-age experience and what did Frenchie learns from him/her?

An old woman, Minerva is dark, round and tiny. She doesn’t speak much and has “old-timey ways.” Eventually, the reader learns that Minerva is capable of destroying the Recruiters’ marrow-harvesting system, which she resists by turning her dreams into songs in her native language. A Recruiter shoots Minerva dead during the camp’s efforts to rescue her. Frenchie learns about his own people and identity through Minerva: she inspires him to keep fighting.