Soldato
If you're getting done in lane you can stack the jungle then just acid them (acid is composite damage which is nice) and bulk kill stuff. The timer is 20s between kills and you really need to keep it up during laning, don't mega kill everything then need to wait for the lane to catch up else you'll lose difference * creeps in gold which is well over 100g a wave All you really need in lane is a ring of health (don't build bf on him though, please to god don't do it) and once you're 6 you'll be laughing.I keep having the most terrible games as Alchemist. Occasionally I can do amazingly if I can manage to get my last hitting right, but otherwise I just end up so terribly.
Best bet is to lane with a stunner/disabler (ranged) and then you can do ranged stun into your stun into death. Just remember to release your stun onto them at the end of your friends, doubling up the stun will just let them get away. Shaman, Veng, lina, shadow demon - this sorta thing. If you end up laning with someone who has no CC you're going to have a bad time unless they let you just sit back and farm. The pros get a quick shadow blade then stuncharge>SB>stun>kill which is fairly easy to replicate from around level 8 onwards.