I think, right now at least, Spike might be one of the weaker characters in the game. A lot of the time he has to try a lot harder than the majority of the cast. Which is a shame because we all love the funny cat fella. My proposal is that we give him a buff, but have it be a double edged sword.
+13% to his weapon damage, but at the cost of -13% damage at range. This would allow him to be really powerful! But outside of obvious picks like the Albatross and Laika, he'd be a dominantly medium to short range character.