Giving Jarven IV his own niche
As it stands J4 is kinda of redundant, He is so much like Garen at a glance that he comes off as a OC mary sue,
Garen is a noble? Jarven is a Prince!
Garen has a thing for Kat? J4 is so kewl all the babes want him,
This isn't all true, but it comes off that way, So what can we do about this? Simple, make J4 Garen's antithesis within Demacia, While Garen is a morally strong man whose Patriotism drives him to be good loyal honorable and even kind, J4's drives him to do questionable things, Like manipulate others,
For example, If Iona calls for aid in war, he will send it! on the condition they become a demacian colony,
This also helps him play the rival to Swain better by making them not so different underneath it all,