My idea for this is a robot with radiant powers.

Abilities:

Each ability has one charge.

Every ability it has is essentially identical in that it copies the corresponding ability of a dead enemy and gives you one charge of it. For example, if you use "Q" on a dead enemy sova, you get one use of his shock dart for the round. If you use "E" on a dead enemy Killjoy, you get one use of her turret. If you use your ultimate on a dead Brimstone, you get his ultimate, etc.

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Ability Costs:

Each one costs 200 credits, and the ult is 7 points

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Notes:

You can copy more than one ability from the same dead enemy.

If this were to be implemented, I think to make development easier, the voice lines for the abilities could just be the same as whichever agent you copied it from but with a robotic filter over it to distinguish it. This is why I thought of the character as a robot.

I personally think this is a very niche character and it may be difficult to use all your abilities effectively, since you have to think on the spot and strategize according to which abilities you're going to have access to. That's why I think this character will have a high skill floor and this iteration might be underpowered.