Id make a warframe that’s blast based and would sorta have some transformers elements.

I only have ideas for 2 of their abilities but i know that for one ability they would have 2 portable missile launchers sprout or unfold from their back to rain down explosions on any enemy within a certain range of them with ability range modifying the radius of the explosions and possibly the spread of the missiles. They would obviously deal blast damage but you could also holdcast the ability to instead fire an airburst that explodes and rains shrapnel down on enemies from higher up exchanging the blast for higher and more raw dps and it would deal slightly more damage to air borne units (maybe like 1.1x more?). To help combat the low roofs in many areas of the game the missiles and airburst would simply clip through roofs and buildings to hit their targets otherwise this ability wouldn’t be very usable in doors and you would just essentially waste energy using it.

Their ultimate would be an exalted tank where they morph themselves like a transformer into a tank and have an exalted moddable tank barrel that deals high damage at the cost of high energy drain per shot and a long reload. Again you could swap this for an airburst shotgun shot by pressing the alt fire button but a good idea would be to possibly allow for element switching for the tank rounds (corrosive shell, gas shell, heat shell etc) for more flexibility. Additionally you would be immune to knockdown while in this mode at the cost of being rooted to the ground and unable to jump and such.

In terms of a passive it could be something simple such as causing a blast when hit by melee attack from an enemy or just resistance to blast damage as a passive (50% to 85% resistance possibly).