#4 is Outskirter. He's one of the bandits that attack you when you're leaving lake in the beginning, choose to listen to the voice and tell him he's your slave and he'll join you after you sleep at the inn.
Also you can have Telle from the start of the fight... just tell Gotor that you're just escorting a girl and Telle will pop up behind you and say that was noble of you.
I just potionspammed my way through that fight btw... wasn't a biggie. Though I think my first character isn't turning out so well... (sword&board fighter type, though with dagger/rada's blade for a bit of speed).
I was looking through the weapons at merchants and the combat circular saws looked interesting(very fast vs normal for dagger), so I made a second profile and tried that out, put everything in mechanic/retractable blades, speed-ran the encounters along the road(and did the axe mini-quest), bought a lvl 2 circle saw... and wowie. From then on it's been easy mode. Level 8 bandits by the lake? Cake at lvl 4 with just Telle for companion, Gotor and company? Cake.