I can't believe nobody's commented on this yet! I thought Kimba was more popular than this, especially on an MMORPG involving lions...
I watched the 1997 movie for the first time today and thoroughly enjoyed it. Makes me want to watch the original 1960's tv show. I enjoy The Lion King too, but I can definitely see where Disney got it's inspiration. And it makes sense, because Tezuka himself was inspired by Disney.