Echo is nice. You can give him something like kamikaze and it won't damage him.

In the tutorial, you should be able to pass with draco and mystik, given you have good partners. Since you have draco, who will be weak to water, maybe you want to try to get a grass type partner for him.
I recommend rolling on and on in the beginning until you get a 5, so you won't waste dice. Use dice to get to the next tree well. Roll randomly and fight. Use dice to get to the next tree well. Use dice to get to the boss.
At that point, if neither you nor your partner has lost a monster, you should be able to win, given you have the grass partner and/or you don't bump into double gnasher's in the end. [Maybe your mystik can handle them?]
I like ghost partners because it means that leshy will kill them first. It gives me time to hot smoke leshy, damaging and increasing my dodge. By the time he's killed off my partner, I've already dealt atleast half his life, increased my dodge quite a bit, and I can probably attempt to pyro him until he's burnt dead with flame debuff.
Also, I do suggest using jelly and/or potions instead of armor, if that's what you're using. Personally, I prefer potions.