Leona's pretty cool, I like her design and her kit is really fun, but what I don't like is that she's only truly viable as support, and really the only support champion who can't go anywhere but bot lane. She's the only one who can't have much diversity in her build due to only being able to fulfill one role, which is support.
Don't get me wrong, I love playing support (Nunu and Lulu are my favorites), but sometimes I like to take support champions to other lanes where they're still actually viable. Lulu mid/top and Nunu jungle/top/mid are fun, and the reason I like those champs is because they can actually do other roles. Why can't Leona do the same? Is Riot scared that she might be overpowered?