Jeume is the first "Crystal Warriors" character available to be summoned. A Wind bruiser that's tanky enough to take a lot of hits, but also strong enough to be a competent damage dealer.
As a tank, she has many layers of defense: Good resistances, Phy Barrier, Protect+Shell, and some DEF increasing passive. She also has some self-sustain potential since she has a draining attack (Stormsiphon and AP Drain). In terms of offense, most of her attacks are pretty strong and comes with some debuffs, but is slightly held back by expensive AP costs.
In comparison to Mont (King of Leonis), Jeume has better defensive buffs, making her noticeably tankier than K.Mont. Her attacks also inflict debuffs that are guaranteed to land, even if the attack misses, while K.Mont's attacks can inflict dangerous status effects, but they need to hit and some luck (faith).