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How about a mobile-mini-tank skin/theme for kog'maw?
Like from metal slug
Here's an un-texured 3D model done by someone
I think this kind of tank would synergize perfectly with Kog'maws abilities, even his death passive.
You could self-destruct into people and explode. http://fc03.deviantart.net/fs12/i/20..._by_klesik.jpg