Getafix - druid. In appearance, as you can see you can buy various plants, potions, mushrooms ect... For everything that's bothering you in life, he can have it, or he can make it.
Everything else is up to you :D
Although some of his potion also causes people who takes it to lose their recent memories (black holes) while also interacting badly with the other potion you take. (joke :D )