Ultra Ezrajal

Honestly if you really wanted you could run mostly anything but there are spots like AP/LOO/LR that are that can't always be replaced, LOO and LR in particular. You can use any DPS also. There are no weird difficult mechanics but he has a counter attack so it is a good idea to hit esc when he starts the counter attack. Also make sure your useful skill doesn't get locked.

Class Enhancements Consumables Extra Information
LOO Awe Blast/Forge/Vainglory Body/Divine Elixir + Potent Honor
AP Valiance or Ravenous/Forge/Vainglory Fate/Destruction Elixir + Potent honor
CaV/any dps Valiance or Dauntless/Anima/Vainglory Fate/Destruction Elixir + Potent Honor
LR Dauntless/Wiz/Vainglory Sage/Malevolence Elixir + Potent Honor

Ultra Engineer

Destroy the defense drone first as it has a counter attack. You have an option to taunt the nuke but usually you kill him before that.

Class Enhancements Consumables Extra Information
LOO Awe Blast/Forge/Vainglory Body/Divine Elixir + Potent Honor
AP Valiance or Ravenous/Forge/Vainglory Fate/Destruction Elixir + Potent honor
CaV/any dps Valiance or Dauntless/Anima/Vainglory Fate/Destruction Elixir + Potent Honor
LR/any Dauntless/Wiz/Vainglory Sage/Malevolence Elixir + Potent Honor

Ultra Warden

Boss drops your hp to 1 every 5%, LR can taunt here to prevent the party getting wiped. Alternatively can replace AP for something like SC/LH for more consistent heals, it's better to have more heals than

Class Enhancements Consumables Extra Information
LOO Awe Blast/Forge/Vainglory Body/Divine Elixir + Potent Honor
AP Valiance or Ravenous/Forge/Vainglory Fate/Destruction Elixir + Potent honor
CaV/any dps Valiance or Dauntless/Anima/Vainglory Fate/Destruction Elixir + Potent Honor
LR Dauntless/Wiz/Vainglory Sage/Malevolence Elixir + Scroll of Enrage Spam taunt