Now that I can also see what graphics you have in mind and what the Wordmark should look like I can aprove even more to the changes.
I think going for a new theme won't hurt the Wiki. It more likely make the Design look more modernized as the last game was released in 2010, so going with the current Art Style for the Franchise would be the best bet.
I'm not really sure about how the front page should look like . From what I've seen from so many other Wikis I'm indecisive of what look we could go with to make it look more organized.