EdroGrimshell

Except that if that was the case it wouldn't negate Atium and it's described as projecting multiple shadows when facing against an atium user.

Myles does it with his gold spikes for compounding, IIRC.

Well that's a point of contention with the way compounding is described. The hack is described as using the power of one system with the benefits and drawbacks of another system. So using Feruchemy with Allomancy for compounding gives the power of Feruchemy (ability to store up and tap into traits) with the benefits and drawbacks of allomancy (net gain of power, no physical change in the body, and burns the metal). It's entirely possible that a Pewter Twinborn doesn't have that downside when compounding.

Bands of Mourning gives a better explanation of it but essentially Nicrosil stores the investiture that makes allomancy and feruchemy possible, tapping it makes your allomancy or feruchemy stronger while storing it makes it weaker. It's most likely the trick behind TLR's exceptionally strong allomancy outside of potential hemalurgic enhancement.

Iron: Allomantic. Just for the ironsight. I don't give a damnation about flying around with Steel, and storing weight, while it could be useful, doesn't appeal to me much. Plus being able to pull things towards me is useful. Steel: Feruchemical. The most broken feruchemical power, even if it is hard to actually store up most of the time I'd prefer this over steel allomancy. Being able to go fast would be fun for a change. Tin: Feruchemical. I love this because storing is just as useful as tapping. While it may not enhance my night vision that much, I can learn to be Daredevil and just use my hearing instead. Pewter: Allomantic. Rolls several feruchemical powers together that I can store. I'd love this one so much since I could be Captain America for a while with it. Zinc: Feruchemical. Useful. I usually don't have to worry about thinking fast, and I often think too much. And tapping it would be such an interesting experience, maybe actually let me get my story inspiration going when I get stuck. Brass: Feruchemical. I hate the heat. Summer sucks simply because of heat and humidity. It kills me every year. I am so gonna abuse feruchemical brass to keep that from happening. Copper: Allomantic. While I have a bad memory in general, in the Mistborn universe, this would let me hide my limited allomantic abilities very well. Our world, I'd still take this because of Atium hemalurgy. Bronze: Feruchemical. I'm a night owl and sleep in as it is, why not make good use of it so I can stay up when I need to? Not to mention it cures mental fatigue, which I have issues with during the day. Cadmium: Feruchemical. My favorite feruchemical power, especially with Allomantic Pewter, don't ask why, I have no idea why. Still, the ability to go without breathing could be fun. Bendalloy: Feruchemical. Eat all I want, store up the nutrients and caloric energy, get the taste going, and even lose weight? Sign me up. Seriously, this would be the best way for me to diet ever. Gold: Feruchemical. Who doesn't want damnation near regeneration?! This would be a prime one to get doubled down with Atium or Pewter Hemalurgy. Use it to feign sickness and get out of work, tap to get over being sick for the fun. Or double down to compound and be a superhero. Electrum: Allomantic. I don't need the determination much, while I am prone to moments of lethargy and apathy, I think I can be determined when I need to be. Chromium: Feruchemical. Luck is fun. I love luck based builds in games for the sheer fun of it, plus my money problems would be over once I hit a casino. Nicrosil: Feruchemical. Amplify my allomancy? Sure thing! Even with only Iron, Electrum, Pewter, and Copper, I think I'd like this one a lot. Plus with Aluminum I can hand off my metalminds for other people to use. Fun. Aluminum: Feruchemical. Mainly for the above handing off of metalminds. Duraluminum: Feruchemical. Language! God I want to go to Japan so badly! This would let me speak with people there and make friends quickly. Hell, I'm tempted to grab Allomantic Duralumin with Atium Hemalurgy just for that option! Atium: Hemalurgic. So many ways to do this. Grab Duralumin or Gold allomancy to enhance the feruchemy or grab feruchemical copper to get a perfect memory. Allomantic Tin so I can have the night vision without the other obnoxious senses giving me issues. Allomantic chromium for infinite luck or allomantic nicrosil for infinitely enhanced allomancy. Allomantic Zinc for compounding so I can write better as well as manipulating people some. Allomantic Brass to calm people down since I hate people being angry. Wouldn't compound though, I hate the heat. Maybe Feruchemical Electrum so I can stay on course with my stuff and stop second guessing myself. God I don't know which I'd pick. Probably Feruchemical Copper for the eidetic memory compounding would give me, but there are just so many options!

I'd probably look into a pewterarm, personally. Survivalist type rather than a fighter, uses wits and careful planning as much as he does the extra physical power from Pewter. Possibly a savant, probably not though. If I were to add a feruchemical power, it'd be Zinc, emphasizing his ability to plan out and set up. If he ever got spiked, I'd go with Tin as a kind of reverse of Spook.

Other way around. Cadmium creates a bubble of slowed time while Bendalloy creates a bubble of accelerated time.

You'd also want Bronze, Brass, Gold, Bendalloy (with hydration rather than calories), and Cadmium so you wouldn't tire while running. And you wouldn't need much of each, a Gold Earring, a Bendalloy and Brass Ring, a Bronze necklace, a Steel Bracelet, and a small Bar of Cadmium (wrapped at most pointz) in your pocket or something so you don't get Cadmium poisoning (I know it's cadmium inhalation but better safe than sorry). A little extra stored (or storing in the case of Brass) up of each could get you somewhere fast without tiring out, and probably without sweating much, if at all.

Zinc, Brass, Tin, Pewter, Steel, and Iron are all pretty easily accessible. Beyond those, though, most of the metals are of limited usefulness. Copperclouds aren't needed in our society and you'd be unlikely to find another allomancer with Bronze unless we'd all get the powers, Aluminum is pretty useless for allomancers and Duralumin, while it could be useful, is rather limited. Same applies for Chromium and Nicrosil. Then Gold is useless and electrum of limited use. Bendalloy might be the most useful of the expensive metals though, being able to speed up your personal time so you can study before a test or finish a report for work or something.

uh, every single one of those metals except Atium and Lerasium are real world metals.

Maybe the Copper/Atium Alloy would store the ability to remember things rather than specific memories... now there's an interesting thought.

Huh, could have sworn it was under her portrait...

This... is interesting. I mean I've heard of storing Bronze Allomancy in Nicrosil then tapping it to pierce copperclouds, but not in tin. Though it may be that it can't since I don't believe Allomantic Tin enhances Allomantic Bronze.

I think it's mentioned in HoA. Pretty sure it's the Blessing of Potency. Yea, it is. Mentioned on the Coppermind Wiki

Feruchemy all the way. It's a godsend in the modern world, plus I love systems that have an inherent resource management.