I got this idea from the Cult of the Forgotten website, so all credit goes to them! (They're a dark/evil RP guild on Wyrmrest Accord.)
What would your character be like if he or she was a raid boss? Where would they be, what would they say on aggro? What stages would they have? What attacks? How would you slay this boss? What would they drop?
Note that these can be pretty long! They take quite a bit of thought. However, they can be fun to write out and think about.
Now, mine is a very long, very in-depth example. You do NOT need to make it this ridiculously long! xD I'm pretty sure this boss has more attacks than any in the game. I had way too much fun writing this... Don't be scared off by it. Yours can have one stage and three attacks, I don't care!
Things to write...
1. Name and Title
2. Location. As in, zone, specific dungeon/area.
3. Locations specifics. What's the boss room like? How is the boss standing? Are there any other NPCs in the room?
4. Appearance. It can be as simple as "Red-headed female blood elf" to a long, in-depth description.
5. Stages. List the time or % health is lasts, and how the fight works. Name attacks that the boss uses - you can define these attacks after you have all the stages laid down.
6. Attacks. List them and tell what they do. You don't need damage specifics - just "Low" "Medium" "High" or "Cloth/leather/mail/plate killer". Also tell what the CD is and which stage it's used on.
7. Quotes. On aggro, on stage change, on specific attacks, etc.
8. (Optional) Loots. You don't need to be specific, just "Leather caster" "Plate healer" etc. Does your character have items of value on them? These might drop as loot.
Here's my first one, my Tauren Druid. (Note that he's blind.)
High Corruptor Lightfur
<Druid of the Nightmare>
Location: Moonglade, in a cave south of the Stormrage Barrow Dens.
-The area around the cave is dead and tainted, much like Felwood. Nightmare Beasts roam the area, all level 85 Neutral mobs. (So they don't kill the noobies) Inside the cave, there is a narrow hallway leading to a very large dome-like cave. Two level 87 Elite raid-worthy Nightmare Monstrosities stand guard at the end of the cave. They're aggressive mobs.
The cave is dug out of the dirt, with tree roots growing out of the ceiling and walls. All of these roots are corrupted. In the center of the room is a tree, standing as tall as the cave is high. It's twisted and malformed, dark spores falling from it. A small blue spider hangs upside-down from a branch.
Lightfur kneels before the tree, a dark green aura around him.
Appearance: A light grey furred tauren male. He's of normal size, although all of his beast forms are larger than normal. Scars cover his face from his snout to his forehead, crossing his eyes. Said eyes are only sunken eye sockets, and are the same in all forms. Dark spores fall from his form.
Moonkin Form: A dark grey-brown moonkin with a grey belly and a black "hood" of feathers. The trinkets on his body glow green.
Bear Form: A very large tan bear. The druidic markings on his face and shoulders glow a dark green.
Cat Form: A large, strongly built dark brown lion with a tan mane. As with bear form, all markings on him glow green.
Trent Form: A huge blackish grey tree of life. (New Model trent.) His leaves are grey dark, ugly green. Stage 1: Moonkin Form (100%-75%)
-Stands by the tree and casts spells at the tank. Randomly casts Moonfire at a random target. Uses Starfire, Moonsurge, Wrath, Typhoon, Hurricane and Enveloping Winds. Enveloping Winds is always cast on one of the healers but can be dispelled. Hurricane MUST be avoided. Will occasionally cast Thorns on self, in which time all melee DPS must stop.
-Casts Call Nightmare at 75%.Stage 2: Bear Form (75%-50%)
-Attacks the tank. Sometimes charges a random RDPS or Healer and must be taunted off. Stacks Grievous Wound on the tank and must be juggled between Off Tank and Main Tank. Sometimes casts Swipe, damaging all melee-range raid members.
-Ferocious Regeneration at 60%, bumping back to 75% in 5 seconds if not removed.
-Uses Rabid at 55%, doubling damage done and stacking Grievous Wound more often. DPS race.
-Casts Call Nightmare at 50%.Stage 3: Cat Form (50%-25%)
-Stealths. Pops up behind random raid members and attacks with high (but not crushing) damage. Heals must heal the victim quickly or they will die. After 2% damage is dealt to Lightfur's health he will vanish and attack the next random raid member. Stops at 30%, leaping to the tank and using Tiger's Fury. Damage is then doubled and he must be nuked to 25%.
-Uses Call Nightmare at 25%.Stage 4: Trent Form (25%-1%)
-Constantly casts Rejuvenation for 5% health over 20 seconds.
-Periodically casts Regrowth for 2% health and an extra 2% over 10 seconds.
-Casts Deathbloom on the tank, stacking to 3. Must be taunted off and the affected tank must run away from the rest of the group, lest he will deal massive damage to any raid member near him.
-Casts Cursed Tranquility at 5%. All raid members WILL DIE unless he's finished off in 25 seconds. Heals for 1% every 10 seconds.
-Casts Call Dream at 1%.Stage 5: The Emerald Dream (5 minutes long)
-The raid is teleported to the Emerald Dream and must protect the Spirit of Lightfur
-Nightmare Beasts and Nightmare Monstrosities attack in waves between Spirit fights.
-At 1 minute the Spirit of Lightfur summons Corrupted Spirit Eagle, which is a high damage, low health elite. Must be nuked down.
-At 3 minutes the Spirit of Lightfur summons Corrupted Spirit Lion, which is a medium damage, medium health elite.
-Nightmare Corruptor spawns at 4 minutes, and both dead spirits resurrect as Pure spirits. They help the raid kill the Corruptor. If it's not killed in 1 minute, the raid is teleported back to the cave and Lightfur is restored to 5%. Corruptor has high health but deals relatively small damage, all damage is in AoE form.
-Throughout this stage the tree begins to turn a lighter shade and grow more leaves, looking healthy again.Call Nightmare stages
-The raid is teleported to the Emerald Nightmare. Nightmare Beasts spawn, along with a single Nightmare Monstrosity. The raid is teleported back to the cave once they are all killed. During the fight, the tree in the center of the area (same as in Lightfur's cave) pulses out mana, restoring 25% of the raid's mana.Attacks
Moonfire (moonkin): Deals medium damage over 7 seconds. 16 second cooldown.
Moonsurge (moonkin): High damage instant attack with a 3 second stun. 30 second cooldown.
Starfire (moonkin): High damage long-cast attack with a medium damage AoE. 4 second cast, 20 second cooldown.
Wrath (moonkin): Base attack. Short cast, low damage. 1.5 second cast.
Hurricane (moonkin): Large area AoE, instant cast. Deals crushing damage over 10 seconds to anyone under it.
Enveloping Winds (moonkin): 1 second cast, stuns the target for 10 seconds. Curse, can be dispelled. 20 second cooldown.
Thorns (moonkin): Self-cast instant. Deals large damage to anyone who attacks, lasting 12 seconds.
Grievous Wound (bear): Debuff cast on the tank that causes the tank to take 15% more damage, stacking to 3. Lasts 10 seconds, 8 second cooldown.
Swipe (bear): AoE dealing medium damage to all melee characters in range. 10 second cooldown.
Ferocious Regeneration (bear): Self-heal bumping Lightfur up to 75% health if not removed. Magic.
Rabid (bear): Enrage increasing his damage done by 100%. Grievous Wound cooldown lowered to 5 seconds.
Pounce (cat): Leaps from the shadows onto a random raid member, stunning them for 5 seconds.
Ravage (cat): Used after Pounce, dealing high damage and causing a low damage bleed that lasts 10 seconds.
Tiger's Fury (cat): Doubles damage and increases attack speed.
Rejuvenation (trent): Heals 5% health over 20 seconds, instant.
Regrowth (trent): Heals 2% health and an extra 2% over 10 seconds, 30 second cooldown. 3 second cast.
Deathbloom (trent): Deals low damage to the tank and an additional medium amount of damage over 7 seconds, stacking to three. 6 second cooldown. At 3 stacks, the tank deals high damage to all nearby raid members after 6 seconds.
Cursed Tranquility (trent): Heals for 1% every 10 seconds and deals 4% damage to the raid every second. Instantly kills all raid members at 25 seconds.
Call Dream (trent): Teleports the raid to the Emerald Dream stage.
Call Nightmare (all but trent): Teleports the raid to the Emerald Nightmare stages.
Shed Mana (Nightmare/Dream Tree): Restores 25% raid mana over 5 seconds.Quotes
(Monolog): Who is it that I hear, trespassing in my domain? Do you come to kill me? Only in your dreams, fools. And as you will soon learn, I am a master of nightmares.
Aggro: All life obeys me! What hope have you?!
Bear stage: I have born mountains on my shoulders! Your attacks are but the biting of flees!
Rabid: Graaah! Face the fury of the wild!
Cat stage: Try fighting blind as I do! The shadows favor me...
Tiger's Fury: Insects! Dirt under my claws! DIE!
Trent stage: Watch as your triumphs unravel!
Cursed Tranquility: NO! You will NOT succeed! NIGHTMARE, BOW BEFORE ME!
Killing a player: Whither in the Nightmare!
Alt. Killing a player: I grant you freedom!
Wiping the raid: Pathetic! The Nightmare will consume your souls!
Death: Lioness... Meet me.. in the Dream...
Lightfur's Spirit dies: Consumed...