These are not in any particular order!
Monster Hunter : White Fatalis
This dragon is a combination of the lighting and dragon elements. It is intimidating in size and on top of that when it attacks it means almost certain death, so make sure to gear up properly. Good luck!
Final Fantasy: Sephiroth
Look at that hair! This guy is a bitch to fight, but his moves are hypnotizing. Sephiroth is the result of an experiment and angered by this knowledge, he decides to become a god and take over the planet. In my opinion, the hardest version is in the Kingdom Heart series.
Street Fighter 3rd Strike: Gill
The leader of a secret organization which seeks to turn Earth into a utopia. He fights with fire and ice, and every hit either freezes you or scorches you. In addition to those obstacles one must also overcome his regeneration ultra. I say the ultimate obstacle is just looking at him; he is so creepy looking .
Pokemon: Red trainer
The Red trainer (which has to be Ash right?) from the Silver and Gold edition is a pain in the ass to fight. He has all the starter Pokemon: Blastoise, Venasuar, and Charizard, and they are at a ridiculous level. His trump card is going to be that annoying but adorable Pikachu, at a pulverizing level 88. Make sure you train your ass off.
Guilty Gear XX: I-no
Sexy but deadly, her weapon of choice is a guitar. Could she be any cooler? Its hard enough to pay attention while fighting her, add the guitar in and one has another distraction. The first time I fought her was a joke, I lost in a heart beat. Patience is the key.
Dragon Age: Flemeth
Flemeth, the legendary “Witch of the Wilds”, is a powerful sorceress that rescues the player and Alistair from Ostagar. As part of Morrigan’s personal quest, one may choose to spare her and allow her to leave in exchange for her Grimoire or attack Flemeth ,in which case she transforms into a bad ass dragon. Overall the battle is a struggle. Her attacks are awesome and I wish she would join the party but be prepared to invest some time.
Parasite Eve: Ultimate Being
Hands down one of the most disturbing bosses out there. The ultimate being has three stages but the first is just plain creepy. Granted, it begins to look like a badass as the fight goes on, but the initial shock lingers even after the battle.When it first emerges all you hear are baby cries and it continues to make those eerie cries during the fight. Make sure you check out the link below for this one!
Dot Hack: Skeith Terror of Death
Skeith has seven phases, each of which are equally annoying. He appears as a humanoid seemingly made of rocks with floating appendages and a two-piece ring-shaped horn. Skeith carries a red staff, which he uses to ‘hang’ (looks similar to a crucifixion) his victims prior to Data Draining them. His weakness is hard to determine and constantly changing, your best bet is to bring a crap load of healing items.
Leader of the Foot Clan and Splinter’s archenemy, he is a highly skilled master of Ninjutsu, stealth, hand to hand combat, strategy, and has a genius-level intellect. Shredder is in peak physical condition and wears a sweet ass armor set… I couldn’t ask for more.
Guitar Hero: Through the Fire and Flames
Alright, this is not your normal boss. First off it’s just a song, a freaking awesome one but it is a bitch to pull off, especially on expert mode and that is why it made the list. Need I say more?
Vids of all the “Bosses” :
Fatalis: http://youtu.be/DUzNbl8zZOM Sephiroth: http://youtu.be/463JY-_sN0A
Gill:http://youtu.be/4yKnZSygYT4 Red Trainer:http://youtu.be/jsxFgh36T1c
I-no:http://youtu.be/ugzJmvwm3hQ Flemeth: http://youtu.be/mLn03Dmr_sw
Ultimate Being: http://youtu.be/hAQmbnoqDIM Skeith: http://youtu.be/dwhFIvL6YgM
Shredder: http://youtu.be/e_GoKd7Ynpk Through the Fire and Flames: http://youtu.be/yz6MManqikg