Comics Re-covered #5: FF vs. Diablo and his Awesome Elementals

Diablo was one of the super-villains who opposed the Fantastic Four. This bad guy was a powerful alchemist in 9th Century Saragossa, who sold his soul to the demon Mephisto to lengthen his life far beyond a human span. Having lived for centuries, when the FF meet him, he is a practitioner of alchemy, science based upon the transmutation of elements, and has attained mastery of the alchemical sciences with his genius intellect. Wikipedia says,

Diablo employs a huge arsenal of alchemical potions he has discovered or concocted, that he can conceal in hidden pouches and pockets within his costume. His alchemy, which can transmute elements through means unknown to modern science, enables him to control his own body, the bodies of others, or inorganic matter. His mixtures include nerve gas pellets, sleeping potions, a potion that renders a person inert by rapidly lowering their body temperature, pellets that make a person susceptible to Diablo's hypnotic commands, other potions and pellets that enable him to transmute inorganic matter, create explosive blasts and create beings known as elementals that are composed of ancient alchemical "elements" of earth, fire, air, and water. With few exceptions, all of Diablo's potions and pellets have only temporary effect. He also has alchemical potions which grant him teleportation.

All of that would tend to make you fatigued, but get this: He coats his mustache with a fast-healing Elixir of Rejuvenation to suck on.

I'd like to know what possesses a man who's lived for hundreds of years to choose to dress this way. Maybe the thought process goes like this:

Diablo: If I'm going to be a super-villain, I'm going to need a flamboyant outfit. Hmmm....I'll go with magenta tights with green trim. Let's see, wings on the ballet slippers and long flowing black sashes. There! That's just the look to inspire fear.