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Donkey Kong and Diddy Kong. You are right. They aren't Ground. That was just a homage to the Earthquake, and doesn't really fit Diddy at all. Donkey Kong is really a Grass Type, and Diddy is a Normal Type. Diddy is just athletic, and doesn't really have a type of his. However, Donkey Kong and most of the rest of his clan are Kings of the Barrel. Nay, Masters. Nay, Gods. Being able to infinitely create Barrels was a special ability of Donkey Kong and his Ancestors while battling Mario. They are the Rulers of Barrels. All things Barrels must go through Donkey Kong first. And since Barrels are made out of Wood, and Wood is considered like Grass, Donkey Kong can be considered a Grass Type. Diddy isn't so much of a Barrel master, though. So he can be a flat out normal type.
Link and ToonLink, however, are definitely Flying Types. Flying/Steel, more Specifically... actually, it's Steel/Flying for Link, and Flying/Steel for ToonLink (the first type is the Dominant Type). The fact that Multiple Gods that control Wind back Link and Toon Link up, not to mention that in most, if not all Zelda games with Multiple Tunics, Green is the Color of the Wind (Red = Fire, Blue = Water, Purple = Earth. Link is usually wearing his signature Green Tunic). The title "Hero of the Winds" maybe specific to ToonLink, but it is/can be applied to all of the Links, from the beings that back them up to some of the special weapons that they use. The steel type is for all of those friggin swords and weapons they use (WHERE DO THEY HIDE ALL OF THAT EQUIPMENT!?!).
As for Samus, I'd like to see what makes you think there is lots of Circuitry in her body... there is actually very little to support that. It is technological, yes, which is why she definitely warrents the Steel Type. But there is very little suggesting her to be a Battery-Operated-Copper-Wired-Robotic Lady. However, all of her beam Technology are usually based on high powered Kinetic Energy, and her suit is even shown to be steaming in the vacuum of space, revealing that a heck of a lot of heat energy is created from it. Not only do the weapons that She uses in it, but the suit itself, including it's Varia or Barrier form (which is designed to help her deal with extreme temperatures, specifically volcanic in nature, and in most games is her default suit, [including Brawl]), supports a high relationship to Thermal Energy, also known as Fire. Oh, also, the Plazma Beam isn't the only Flame based Beam she uses. Also noted is the Flamethrower, the SunBurst, the Aniallator Beam (kinda), the Magmaul, and Technically the Nova Beam.
Technically, Straked is right. The R.O.B. is not Metalic. More Plastic. If anything, he should be normal. However, he DOES have wires and circitry flowing within his body. Normal/Electric.
Evil Astetic? He has a Mask on. That's the only thing that could possibly be remotely evil looking about him. And it's not looking evil that makes a Dark Type. It's being a Darkness affiliated being that makes you a Dark Type. There are plenty of Pokemon that look Evil and Scary and Bad that are not Dark. Arbok, Banette, Carnivine, Dialga, Exploud, Feraligatr, Glaile, Huntail, Jynx, Kingler, Luxray, Mawile, Nidoking, Pinsir, Qwilfish, Raikou, Scizor, Tyranitar, Ursaring, Victribeel, Weezing, Zangoose... plenty of these and more "look" evil, but aren't. Infact, Looking like any percieved stereotype of something as esotetic as Evil... or Good, for that matter, can be different depending on the person. For example, I find no Pokemon more evil than Mr.Mime, because Clowns are the most Psychotic of all beings in existance. Being Dark is being linked to Shadows and Darkness. Metaknight could only possibly be linked with the Shadows by his Final Smash. Otherwise, he is definitely not Evil, and just because he wears a Mask doesn't make him Look Evil either. His Color Change to the Dark Metaknight from Kirby and the Amazing Mirror is just that, a Color Change. Nice try. Normal/Flying, or maybe Fighting/Flying, since he is a Master Swordsman. But not Dark/Flying.
An Intrinsic Source. Go look down Godzilla's throat and try to find the generator inside of his belly that is the source of his Atomic Fireblasts. Heck, go find out where Swampert keeps the gallons of water used for it's Hydrocannon, while you are at it. Captain Falcon is like the king of Fire. It is as if the Phoenix blessed him and his Martial Arts skills with the power of Flame. The only reason he's not Captain Phoenix is because that's incredbily Gay. Falcon is much cooler. Fighting/Fire.
I don't know much about Fire-Emblem though, so I will take your word on Ike. Fighting/Steel.
And as for Explosions, In Pokemon, Razor Leaf has been used to make Explosions. SludgeBomb can be used to make Explosions. Hydropump can be used to make Explosions. Thunderbolt can be used to make Explosions. Shadowball can be used to make Explosions. Nearly everything can be used to make Explosions. But most of the time, Explosions are gigantic bursts of Kinetic Energy (typically associated with Thermal Energy).
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