Perhaps Adding:
1. A Delayed summon feature, Holding the summoning trigger on the specified location places a beacon or an unseen marker that can be held for 5 seconds before the Mech arrives. This will give players time to relocate and potentially flank your enemy.

2. Buffer Shield: Like certain bosses Aneska's Mech should have a shield that negates too much damage being received from a single shot or over the course of a few seconds.

3. Give Aneska a limited range where she can summon her Mech a distance away as opposed to only in her immediate location.

4. Give the Mech a passive feature where shot from Grunts exclusively deal reduced damage.

That's all I got.

I'll get right on it lol

It would be nice to see her have a dash tackle ability or be able to transition out of her form with a melee attack so you can get into combat immediately.

Second. I'm surprised this wasn't brought up sooner.

Tolchok is your answer to all incoming Raiders, Anatgonist & Elites but All its good for (considering what was just mentioned)  otherwise is temporarilly keeping enemies away, its ass when it comes to damage and the push effect is only for medium to close ranges.

My answer to keep things simple, Max out his Hornet, it doesn't disappoint. If they dont deal enough damage to you quick enough the Hornet at any range (will) melt them. 

Ideally you don't want to take another raiders gun type and apply it to another (least likely to be considered that way, not that I think there taking any idea at all.) but If you meant to in the sense that there is a load up time and the gun continues to fire until the ammo runs out or overheats....I get that. I'm just saying a Mini-gun specifically might be stretching it.

But the main point of your idea isnt the gun but the Mech itself. I'd imagine they'd want to work with a concept that's simpler to do. I'm saying that because I think creating a whole animation for a gun is too much work and money. An alternative to your idea is that your Mech will leap away and plummet with a damaging AOE push effect on the area you shot the gas canister at.

I think were a year off before the next campaign. Theirs too much that needs to be done before then.

If its faster than the Whip then you need to react fast enough to not only shoot the first orb but also the second. That reminds me of her other gun Earthing. Its very fast and you need to shoot it as it explodes multiple times, you could shoot it a second time but by then its way too far away.

But anyway it spreads outward in a cone fashion, so it can cover more area. Perhaps the Base shots can spread horizontally to maximize on that idea.