A saint and war monk of Ylisse with a calm and composed nature; he joined the clergy after a painful life of neglect due to being abandoned by his parents, which left a literal scar on his neck as revealed in his support with Nowi. Due to this he developed a distrust of people and even haphephobia, or fear of being touched. While the details of his past are never made explicit, it is heavily implied that Libra seeks to atone for it, first by becoming a priest to help others, and then by lending his strength towards Emmeryn's rescue.

Hearing of Emmeryn's impending execution, Libra and a group of his fellow clergymen head off to Plegia to rescue the Exalt. However they are met by the Grimleal along the way and slowly, their numbers dwindle until only Libra is left. Libra arrives at Plegia Castle in Chapter 9 just as Gangrel is about to execute Emmeryn. He fights his way through some of the Grimleal there until he eventually encounters Chrom and asks to join his ranks to save the Exalt.