Jean is the leader of the knights of Favonius the older sister of Barbra and is mostly seen in her office doing work of some form in her office. Or just making sure Klee doesn't get into any more trouble. She is a tireless worker and does not get much rest. She is often serious and collected. willing to do anything to preserve the people of mondstat. even over her own well being. She has a medium tone of voice as well. 

Jean voice lines: https://genshin-impact.fandom.com/wiki/Jean/Voice-Overs