I have some idea on how to advance Jarvan’s lore and make him more in tune with superheros b/c Marvl

Make him wear this light suit of armour that completely covers everything except leaving breathing room for the mouth/eyes. He uses this armour to go out in secret and save mages from discrimination either from humans or mage hunting beasts. Nobody knows The Knight’s true identity except Jarvan himself. He feels like he needs to do this because if he openly defends mages as Prince Lightshield it would be a disaster and it would ruin his chances of getting elected King which would in turn ruin chances of a political reform. However, he cannot sit back and do nothing because that would send him into a deep depression so he acts as The Knight (name subject to change it’s generic I know) to feel great about helping mages.

Cue in stories where Jarvan’s father tasks Demacia’s greatest and most fearsome warrior Garen into hunting down this “terrorist menace” and Garen has no idea it’s Jarvan.

Cue in stories where Jarvan has an identity crisis because The Knight and Prince Lightshielded are two contradictory characters.