YB and Specter are impossible to tell apart. Recognizing them in combo with Lesser is tough, but you would be looking for heavy blushing and coloration differences, and the two that look the most similar don't have drastic enough blushing or the right color. Instead of having greyish dark spots around the dorsal, it's more a bronzy color. The different colored one matches the color it should have mostly, but Enchi is making it a little different than it would be otherwise.
The easiest way to see Enchi in most combos is the eye striping. The part of the yellow stripe near the neck ends up often being especially thick and sometimes connecting more to other pattern than without.
No Superstripe because that almost completely disintegrates the side pattern to where there is only speckling and faint outlines of smaller alien heads, and Lesser would only make it even fainter and smaller.
Fire can be really tough in some combos, especially if it's a weaker version.
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