User blog comment:Myself v1.0/Failed hybrids?/@comment-5419795-20120906224808

I think a large part of why there are few effective hybrid champs is a balance issue. Hybrid champs, by their nature, do mixed damage. This forces the enemy to build both armor and MR or suffer the consequences. There are certainly ways Riot could make more hybrid options, but for the moment they are erring on the side of caution.