Which champs can solo the dragon earliest?

When I am jungling I prefer to get the get the dragon early, I feel in low elo the boost you get in mindset is almost as good as the actual bonus,so my question is, who can solo the dragon at level 4 or 5. I used to love doing it with Vi and I assume she still can but haven't tried in a while and I know she saw some nerfs...is it still viable?