These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Skullomania becomes this in 2009, where we got Kamen Rider Skull, complete with a scarf and the letter S on his forehead. Personality-wise, though, he's pretty much Skullo's opposite.
The Cycloids become a bit more amusing when you compare them to Seth (making his debut in IV), who does the exact same moveset mimicking as them and (due to his appearance) somewhat resembles Cycloid-γ. Heck, he's even been dubbed "Cycloid Seth" on several occasions.