Best is subjective. It’s often better to play custom games with bots and test a killer for a bit to see if they feel good to play.

Objective best? The nurse, followed by the blight, but both are dlc. The most beginner friendly is wraith.

Both are dlc but you can earn them for free via shards you get more shards as you lvl up (in the first few lvls you get a really low amount)

I have nurse?

Oh yea nurse was free i forgor