Battle Garen, senpai to Ezreal, is Lux older brother and is Katarina love interest. That is the most shonen thing ever.
Hopefully we could also get foreign exchange student Tahliyah and Ekko. Sorcery and engineering respectively. Make Ekko a legendary and we could have a good Rivalry between him and Ezreal.
And maybe Talon for Assassin he is like that butler katarina's family sent to take care of her. Being very over protective and wary of Garen.