Character Details:
Sylvie Reyes is a talented combat medic of Combat Division 1! She's a nonstop chatterbox that loves to make people smile. However, she often puts other people first without prioritizing her own well-being. The constant pressure of pleasing other people gets to her, and it's something that constantly eats away at her internally, like "does she not like me?" or "I shouldn't have said all that.. I'm too much." Anyways! Later on in the series, through interactions with comrades and harsh lessons, she'll learn what truly defines her self-worth. 

Sylvie is an orphan who grew up with her sisters. The whereabouts of the parents are unknown, and Sylvie has never really made an effort to find them. Her sisters are judgmental, rude, and constantly putting Sylvie down. Despite that, Sylvie still tries to be kind and please them. The root of their sister's disapproval stems from their jealousy, as Sylvie was the only one of them who passed the RSA exam to become an officer.

Voice details, line context, and voice reference:

Sylvie is a very high-energy character who desires to please everybody! She may speak quickly and get excited easily. Her voice has peaks and valleys, meaning her voice can get super high at some points and is inconsistent based on her emotions. 
Hu Tao Genshin Impact - https://www.youtube.com/watch?v=km5Gezclgw0 

line 1: She is showing Lunette around the headquarters and is introducing herself. She's EXTREMELY enthusiastic and is rambling, so she should be speaking quickly and slightly stumbling over her words-- but still speaking crystal clear!

line 2: This is her having a heartfelt dialogue with another character. She's trying to be okay in front of them, but her sadness is still showing through her words.

line 3: She's tending to a victim in a casualty. She's trying to spread positive energy while being careful with healing the victim