Everyone is saying Leona is dead
But honestly, I'm not sure people have that right personality associated to her.
**Thematic: **She was born into a warrior people. Yes she detests fighting, but that is not to say she isn't perfectly capable of be an efficient killer.
**Gameplay: **She is one of the most, if not the most aggressive support in the game.
Lore: Although not in the same words as her original story, she still has nods to her passive side. In her old lore she spared a fellow tribsmen, in the new one she spared what appeared to be a child celestial of some sort. Also, she deliberately (for as long as she could) held back her own power when fighting off the barbarians, and she only finished them because she knew they were a threat that would only return. Even in Pantheons lore, rather than pursue that barbarians, she decided to stay behind and only defend from attackers.
In short, yes Leona has had some sort of passive side in the beginning. But whether in this story or her old one, at the end of the day she is, and has always been, a warrior to protect her people.