Clone conversations always bother me because they assume the word "clone" only applies to one type, when really it's a term with multiple categories.
People say Lucas and Wolf aren't clones, but they ARE quasi-clones. Both are still in the overall category of "characters that are based on a pre-existing character's moveset," but that's a mouthful. Can't we just use the word "clone" as a shorthand term to describe the clones of all categories?
And here are the categories for reference, as they apply to every installment of Smash, in order of least different to most:
Tiny Differences Clones (new category introduced in Smash 4)
These fighters have very little different compared their bases. It might be slightly changed specials or slightly changed normals, but never a huge amount of both at the same time. They even have incredibly similar speed and weight.
(base:
)
(base:
)
Regular Clones
The ones we're most familiar with. They provide several subtle-but-important differences on both normals and specials. Their animations stay similar to their bass but their attacks are otherwise very different from them in properties. Their speed and weight may differ pretty heavily. They stopped appearing after Melee.
Super Smash Bros.:
(base:
)
Super Smash Bros. Melee:
(base:
) (leans towards TDC in Melee but is overall in this category)
(base:
)
(base:
, bewilderingly)
(base:
)
(base:
)
(base:
)
Half-Clones
While they do share plenty of several subtle-but-important differences with their bases, these characters also have plenty of completely unique attack animations, and thus different hitboxes. Some of them even have a completely different special move that isn't a mere change in the base attack's properties. Essentially a regular clone but differentiated further a little. Currently the most common kind of clone.
Super Smash Bros. Melee:
(base:
)
Super Smash Bros. Brawl:
(base:
)
(base:
, sadly)
(base:
)
Super Smash Bros. 4:
(base:
)
(base:
)
(base:
, if it's 3 times in a row then it's time to stop hoping for complete differences. Oh well *sad violin*)
(base:
)
(base:
)
Quasi-Clones
These fighters share a vast amount of differences from their bases, much more than even half-clones. The reason they're still clones is that, despite their differences, they can still be identified as being built with a certain character as a base for moveset concepts, especially their special attacks which are very-but-not-totally different. They usually share almost no normal attacks in common otherwise. All 3 of these are most likely to be insisted that they are in actuality a non-clone:
Super Smash Bros. Brawl:
(base:
, only shares 2 specials but plenty of normal attacks as well, unlike the following characters, putting him here)
(base:
)
(base:
)
Super Smash Bros. 4:
(base:
, Brawl explanation still stands)
(base:
)
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So there you have it, 4 whole categories. As you can see, the word "clone" suggests a multitude of qualifiers depending on which category you want to place them in. So when I say both Dr. Mario and Lucas are clones, I do not mean both are regular or half-clones, just that they both fit into the family of "clone" fighters in the Smash roster but in different categories.
Furthermore, there is no need to be defensive or accusatory when I say Luigi, Wolf, or Lucas are clones. I mean no harm by that, I merely state what they are.
It really isn't that hard to grasp if you just play these characters.