The final aspect of your villain is what he does, what it has to do with the plot, the conflicts with the hero and where he fits in the story.
Surely, this is easy when this villain is just another foe to hack down, but then again, why go through all this trouble if he’s only to be mowed down like another piece of grass in the lawn? No, if this villain only exists for combative purposes, he must be one tough nutjob. Defeating him must require great amount of skill and effort from the hero(es), and he may even come close to defeating the protagonist himself! Hell, he may even capture them and send them off to a dungeon they need to escape.
Every major fight has a purpose. If the hero should win, it should be more than just a hard earned victory. Perhaps in order to win, the hero had to fight dirty for the first time. Or maybe it was the first time they ever killed someone….and they killed him so brutally too! The hero should change from a big fight like this; maybe learn a few new things. A heroine who doesn’t like to get her hands dirty may learn to fight for her life ferociously in close range combat. A brute who is used to having the upper hand in size and strength is outweighed and overpowered, forcing him to use his head for a change. A meticulous planner/strategizer (a Shikamaru type fellah) sees their plans fail miserably, but then wins by doing something spontaneous and unexpected. A pair of quarreling siblings learn to put aside their differences and work together with lethal efficiency. A cocky young man, after being beaten to an inch of his life and just barely winning, realizes that he’s not invincible. Difficult fights offer much more character growth opportunities than easy ones; a member of the group matures/grows more confident in self/realizes inner strength and uses a technique that they dared not use before to completely annihilate the villain. This causes their allies to respect and trust them more. Big fights like this are also good opportunities to kill off any characters you need to dispose of, like sage/teachers, parental figures, best friends, lovers, siblings, team leader, drinking buddy, etc. so that the hero is in more danger, forced to grow up faster or just be murderously pissed off for a while. If nothing else, a big fight should at least reveal something we didn’t know before. You see, young otaku, the secret to having a good hero is knowing that the villain makes the hero, not vice versa.
As for non-combatant villains, I can’t say much. They still have ‘conflicts’ with the hero, so use the paragraph above.
Then of course, we have ‘Romantic Villains’, who try to distract their opponents by pretending to be friends or lovers. They are also known as “Filthy Backstabbing Scum”, “Double Agents” and “Traitors”. I don’t know much about them, so use your imaginations.
Jūō’s role in the plot is simple: attack hero’s hometown, be killed by hero, have head traded in by hero for large sum of money. But maybe I should explain further. Jūō attacks the Leaf Village in hopes of obtaining more summons, specifically those of the Sannin and the Hokage. Any summons beyond that would be a mere bonus for him. He beats down the ANBU (including Itachi) and demands that the Hokage provide him the summons. However, the Hokage explains that Jūō is asking for something he cannot give, as only the Sannin could provide him the summons, and none of them are in town. Enraged, Jūō threatens to kill the Inuzuka clan if the Hokage does not let him have the Enma summoning. At this moment, Okuri interferes, easily slaughtering the summons(who were exhausted from beating down the ANBU). Jūō is forced to use his ultimate transformation technique (dubbed “True Beast King Transformation”) and fights head on with Okuri. Although no characters see the fight end, the reader knows that Okuri calls upon Okami’s chakra to finally defeat Jūō. The purpose of the fight is to show how much Okuri has changed since the last time we saw him.
