Coriolanus
Banned
Suriel was one of the ones I got stuck on for awhile. Liadri took longest, then Strugar and Chomper, then the Pirates I'd say.
Hamli is super easy. Go dagger pistol and trait for high burst DPS. I usually go Signet of Malice (Healing), Haste, Signet of Agility, Assassin's Signet and Basilisk Venom. Each run just Stealth to him, drop a blind every 5 or so seconds and use haste to kill him quick. I usually kill him within 20 seconds.
No need for dropping 5. Just use Shadow Shot every time he swings. Blinds and causes up to 4k damage while also being 2 points cheaper.
You can also trade haste for Ambush and drop the trap on top of him, 35sec cooldown but I really couldn't quite determine if the damage the thief could put out was worth halting autoattack.