ARTY

What is the name of that drone?

So could I also use Hardened Platinum Vest as a torso for my 2nd mech?

It's based on current rank and time spent in arena queue. The longer you spend in queue, the further away a potential matchup can be (by rank). This is why you'll sometimes see rank 5 players match with rank 1s, as well as other weird examples in lower ranks. 
As for the weird mechs you see in low ranks, those are smurfs. Players intentionally dropping rank to capitalize on clan win bonuses and the occasional arena win gold boost. Matchmaking has nothing to do with item rarities, but I'd suggest maxing your torso and drone first. 

Another part that affects it is the amount of people playing. As larger the number of players, the closer rank match it will happen. If the number of players it is too low, the game will try to match you in some ways if not the loop waiting will be very long. Also, the match maker will match you up with 2 ranks up or 2 down according to your rank stars at the moment as basic think you can see when season end you might drop 2 ranks if you are less than halfway on rank stars. If you are full on stars, it might drop just 1 rank. 
Let say if you are R4 first star your matches will be in R6-R3 as basic. As more players are in your rank, the tendency will be R4 fights. If not enough can be R5 having more player's base people crossing. If you are an R4 full stars the rank to go for, it will normally switch to R4-R2. Crossing the middle of stars on rank it will shift the match. 
WOW, a rarity to see a top player making comments as used to be. 🤡
This is a today match when checking my mechs for future changes for match tendency with lower cap. Sure, my test mech will win. 🚽🍻

It's based on rank and item rarities. If you want to stop being matched against smurfs try playing at different times when a lot of them might not be online. That fixed my issue with being stuck in the lower levels. I also tried using lower level items but then I'd start losing to normal players sometimes

It's based on rank and item rarities. If you want to stop being matched against smurfs try playing at different times when a lot of them might not be online. That fixed my issue with being stuck in the lower levels. I also tried using lower level items but then I'd start losing to normal players sometimes

What is it based on to match you against other players? level, hp, rarity of items?. Because I've got a mech with all legendary items and I sometimes get matched against smurfs just because they've got a bad torso and legs equipped, and it makes me wonder, should I upgrade my torso to mythical or stick to weapons first?, Will having a mythical torso, meaning more hp match me against full mythical item mechs?

Well, for the second one. Like the first one. A shotgun repulser to not get stuck 
Change the drone in the second one, like the first one
Get more cooling for those hybrid weapons or you gonna overheat yourself
If it's possible, get the same legs of the first one to the second one

How can I improve these mechs and would be around the rank I get stuck at?

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How can I improve these mechs and would be around the rank I get stuck at?

Well, normally the top players do not use Hardened Vest because harder to set up and less HP and phys resist vs the others Vest. Sure, it is premium torso, but people will use better Windigo instead to use that one. The pictures above are in the Legend status L1. 
Same issue happens with the monkey version Hollow
Sure, you can use it but if have too.  

So could I also use Hardened Platinum Vest as a torso for my 2nd mech?

I agree you can use the same weapons for both mechs but I'd start upgrading cooling modules. A build like yours will advance quickly then hit a wall once you find heat mechs that don't require energy at all. When that happens, I'd swap an armor plate with a heat engine and a storage unit with a cooling module.
You can use that weight savings to better your build once you get lucky, like upgrading to an armored combined resistance matrix and double teleporter.

Sorry, I can't replicate in full using lower parts or torso max out.
Just looking at the numbers, you mech cooling and regen will be terrible. Your cap will be decent in some way.  The set up still have some room to add an extra weapon maybe one resist drainer. 
Your mech it is a classic mech for free to play starting points. It will be limited for lower ranks, and I will say will get stuck on R10 or lower in today arena condition. At R10 it is hard to win with that mech. 
The Nightmare torso, been the basic torso to start the game, it is not a wasted gold instead a good investment. Easy to get and can be used to R1 set ups. Some top players and I mean top 10 players indicate that Nightmare it is the best torso around. 
Windigo it is another option to use as second mech without premium part, if not available then make another Nightmare if not luck.
If you don't get Windigo and get Naga, you can also max Naga been close to a Windigo mirror and also easy to replace Naga if you get a Vest because only 1kg on weight apart avoiding having to change your set up. 
At EPIC level Nightmare vs Windigo
1-Nightmare weight it is less but less Hit Point
2- Easy to get because start as common part
3- A bit less on regen and energy grant
4- All resists are equal
5- Cooling a little less. 

 
1- Windigo it is harder to get been an EPIC starting point and sometimes very hard to get like in my accounts. 
2- People use more because a tiny bit better on cooling and regen but it is heavier. With Nightmare you can compensate that weakness due to weight is less. Easier to set up windigo in some ways. 
 

Just use what you have in hands between those two. 
 
For Naga EPIC it is use more on Energy mechs or even phys mech due to energy base. Resist it is as windigo and Nightmare. It is not a waste. Sure, people use more VEST because resist attributes and easier to assemble.

 

and should I keep everything else the same or make any minor adjusements?

and should I keep everything else the same or make any minor adjusements?

Do you have any recommendations on which energy mech tho? I could also use the same one for the 2nd one

This is my first mech. How should I make my 2nd one?

Do you have any recommendations on which energy mech tho? I could also use the same one for the 2nd one

This is my first mech. How should I make my 2nd one?

What modules should I use for this mech?

Energy modules, a shield module and atleast two heat modules in case you want to use that hybrid weapon, I said this like this cause I can't send you a image because the UW don't works for me (For a reason) 

What modules should I use for this mech?

What modules should I use for this mech?