The Story of Jarvan IV
Prince Jarvan Lightshield the Fourth grew up with the weight of an entire kingdom's idealism pressing on him. The Lightshield dynasty is Demacia's royal family, and Demacia is a kingdom built on the idea that nobility means something — that its rulers earn their position through virtue, courage, and sacrifice. Jarvan has been raised to embody that idea, and the pressure of being the symbol rather than the person has shaped him in ways that are still being worked out.
His time on campaign — leading soldiers, making battlefield decisions, seeing what Demacia's ideals look like when applied to actual human beings with actual human problems — changed him. He is not naive. He knows the gap between Demacia's self-image and its reality, including the brutal persecution of magic-users that contradicts every ideal the kingdom claims to uphold. He doesn't yet know what to do about that gap, which is the most honest thing about him.
Jarvan is genuinely trying to be worthy of what he's meant to represent. That's rarer than it sounds, and it's the source of his real strength and his real vulnerability. He can be manipulated through his ideals. He can also be inspired by them to do things that ordinary self-interest wouldn't produce. Whether those ideals survive contact with the throne — when he actually sits on it — is Demacia's most important open question.