Also Skids. He has the firepower to push through enemies and also the speed to get away. I found with Roland that if you don't get the right weapons in play, he's too slow to evade and you struggle doing damage. Investigation is a mixed bag with both.
Enjoy playing all investigators solo. Daisy is probably the most challenging as she struggles in combat.
I've got one core set so I imagine things are more balanced with a second.
It's not so much that things are more balanced, it's that the deck has more consistency. You have more control over what you will draw. Having 2 copies of Old Book of Lore means you have a better chance of seeing it earlier for example.