honestly i love controlling space with Ronin. you just need a way to hit ranged foes with 5 hp for a big chunk of damage so i usually take at least +1 on the spear, traps and hooks are helpful as well. I have yet to get good with assassin, but the super short-cooldown slash is very helpful and an easy upgrade target, all you need is range and/or a multihit like the spear or arrow, and you're largely fine.