Agamon
Adventurer
Note that you can move freely around someone (or possibly even through larger/smaller creatures), and never provoke an opportunity attack; they are only triggered when you *leave* someone's reach. In a lot of ways, it's more freedom than previous editions.
Not to mention Disengage lets you move and provoke no opportunity attacks at all. It uses your action, but it does let you waltz past the front line if there's room (or even if there isn't, if you're a halfling).