I completely agree with that notion - Ivern is a fully realized character. Did you do any of the work on Ivern? One of the themes that I like that was well done with Ivern, is that his personality isn't incredibly complex, when compared to some of the other champions that have been created or reworked.
Either way, his entire theme, design and kit are really well done.
I am one of the development managers for the champion team so I work on all of them to some degree, but I didn't work very closely on Ivern. I'll pass your feedback on to the team - thank you!