This is my personal suggestion for a Colossus set-up while playing through the main story and leveling up to pilot level 30. Early game there is quite a lot of freedom to play however you want as guns are quite effective and most gear is as well (this is not the case in the end game). Feel free to change things out or just do whatever feels good to you personally.
As you level up you will unlock more component slots, maxing out at 6 slots at level 23. Use this list as a guide for the ideal components to use as you unlock more slots. Keep in mind that your Javelin’s shields and armor come from your components, which are based on the item level. You may have to switch out a preferred component for something less ideal if you outlevel it too far and can’t get a higher level version.
The auto pilot combos of Flamethrower plus Lightning Coil will wipe out any group of enemies you run into, since Colossus combos are AoE. Torrent and your Ultimate should handle anything that survives the flame. Colossus has a ton of health, but also takes a ton of damage. Being up close with your Flamethrower and/or Melee will actually help you survive, as you will regularly get armor packs dropped on top of you. The hardest thing about this build is properly managing Lightning Coil and not letting it run unnecessarily so you don't waste charges. Once you get the hang of when to turn it on and off you will find yourself clearing enemies much faster. Final tip, its never too early to start working on the Advanced Colossus Mechanics Guide which will significantly speed up your movement and damage output! Once you get up to or near level 30, check out the Colossus Guide for a great breakdown of all the Masterwork gear that you will start to find from level 25 on.
A relentless assault of Combos and Ultimate damage that keeps you in the fight no matter what your team faces.
A favourite among the Colossus pilots of Bastion, rain down acid filled mortars and detonate combos from a comfortable distance with Venom Storm.
Endless combos at an incredible rate, this Colossus build will make short work of even the strongest enemies.
A highly mobile Colossus build using Voltaic Dome, melee and massive combos to run through content with ease.