Description: He would be better for those annoyed by Stickbug's tedious traits and low durability, since he can explore quickly and will heal quickly when struck. This allows you to stay as him instead of switch to another hero when low on health. Fire Staff is very useful with Leafbug to get great damage since he lost quite a bit of it with focus, and the extra range is also nice to have.
Recommended level-ups: Switch between Speed and Spell Blast, as those would make him able to escape enemies easy. Then regeneration for the times when he does get struck. Health is pretty dull, and only good when Leafbug's currently low on it. You can upgrade the skills together if you want to.