After playing your first playthrough of Dark Souls, the bosses get pretty monotonous. A few of the bosses really aren't even that hard for the first time around, and are even less impressive fighting them a second time. I feel as if many of the boss encounters could have been greatly improved making them tougher.
Here were a few ideas which would have ratcheted up the difficulty that I would have loved. Obviously many of these couldn't actually be in the game for making it an amazing feat to beat any boss, but these are just some random musings.
Asylum Demon
Two demons at the same time. It would be a vastly more interesting fight for those starting a new game for the twentieth time.
Bell Gargoyles
Two Bell gargoyles? Why not all four?
Capra Demon
Nothing. This guys hard, mainly because of the dogs. Maybe if the dogs were eliminated they could respawn after a bit, that would be tough.
Ceaseless Discharge
Maybe take away trick. Man that would be tough.
Centipede Demon
I always beat this guy first time around, so I don't have a huge idea on how to improve him. Maybe make the lava and platforms shift, so you have to move from area to area and platform to platform while fighting him.
Que-laag
Seems ok to me.
Priscilla
I'm not sure, because I've had playthroughs where I am continually one hitted while she was invisible, and plenty where I don't die once. Perhaps making her a bit quicker to go invisible when you are getting hits in.
Gwyndolin
No pillars.
Demon Firesage
Seemed reasonable, if not easy, could add extra enemies in the area such as statues, but that might then become too hard since you really need to watch your distance from his AoE attack.
Four Kings
Faster spawning? with perhaps the ability for more than one to attack you even if you are near another. Although it is pretty hard as is already.
Gaping Dragon
I don't even know. It's just so easy.
Whatever, put curse frogs everywhere, that would piss people off.
Sif
I like Sif, but once you get his attacks down he isn't particularly tough. I don't exactly see away to change Sif to make him tougher though.
Gwyn
No parry.
Iron Golem
Give him unlimited health, allow him to get back up from his crouch faster if you don't deal enough damage, and make you use his raged attack more frequently. Force players to have to knock him off the edge.
Moonlight Butterfly
Hated this fight. It's just alot of dodging. Unless you get Beatrice, then it's cake. No idea how it could be changed.
Nito
Continually spawn skeletons, so that even if you have a divine weapon, you would still continually contend with skeletons. This way you could just fight Nito's very predictable move set alone, but instead contend with a slowly growing skeletal horde.
Ornestein & Smough
Already really hard, maybe make the pillars completely destructible after you take down the first boss so that you can't continue to hide behind their pedestals.
Pinwheel
Skeleton babies, everywhere.
Seath
Dunno, can't think of a way not to make it less of a lame fight. The tail cut off is still tough though.
Stray Demon
So confined and imposing that you really couldn't do anything more. Apparently it pisses people off a ton as is. Never saw it as very hard.
Taurus
Maybe spawn undead hollows on either side of the bridge. Something to keep you on your toes like that.
The Bed Of Chaos
Personally my least favorite fight, since it isn't a fight, but rather an extended platforming section, during which you need to continually run back to the boss if you miss. Perhaps some actual combat would be cool, such as having to fight capra demons while all this fire was going on, since the bed of chaos is the source of these demons.
Here were a few ideas which would have ratcheted up the difficulty that I would have loved. Obviously many of these couldn't actually be in the game for making it an amazing feat to beat any boss, but these are just some random musings.
Asylum Demon
Two demons at the same time. It would be a vastly more interesting fight for those starting a new game for the twentieth time.
Bell Gargoyles
Two Bell gargoyles? Why not all four?
Capra Demon
Nothing. This guys hard, mainly because of the dogs. Maybe if the dogs were eliminated they could respawn after a bit, that would be tough.
Ceaseless Discharge
Maybe take away trick. Man that would be tough.
Centipede Demon
I always beat this guy first time around, so I don't have a huge idea on how to improve him. Maybe make the lava and platforms shift, so you have to move from area to area and platform to platform while fighting him.
Que-laag
Seems ok to me.
Priscilla
I'm not sure, because I've had playthroughs where I am continually one hitted while she was invisible, and plenty where I don't die once. Perhaps making her a bit quicker to go invisible when you are getting hits in.
Gwyndolin
No pillars.
Demon Firesage
Seemed reasonable, if not easy, could add extra enemies in the area such as statues, but that might then become too hard since you really need to watch your distance from his AoE attack.
Four Kings
Faster spawning? with perhaps the ability for more than one to attack you even if you are near another. Although it is pretty hard as is already.
Gaping Dragon
I don't even know. It's just so easy.
Whatever, put curse frogs everywhere, that would piss people off.
Sif
I like Sif, but once you get his attacks down he isn't particularly tough. I don't exactly see away to change Sif to make him tougher though.
Gwyn
No parry.
Iron Golem
Give him unlimited health, allow him to get back up from his crouch faster if you don't deal enough damage, and make you use his raged attack more frequently. Force players to have to knock him off the edge.
Moonlight Butterfly
Hated this fight. It's just alot of dodging. Unless you get Beatrice, then it's cake. No idea how it could be changed.
Nito
Continually spawn skeletons, so that even if you have a divine weapon, you would still continually contend with skeletons. This way you could just fight Nito's very predictable move set alone, but instead contend with a slowly growing skeletal horde.
Ornestein & Smough
Already really hard, maybe make the pillars completely destructible after you take down the first boss so that you can't continue to hide behind their pedestals.
Pinwheel
Skeleton babies, everywhere.
Seath
Dunno, can't think of a way not to make it less of a lame fight. The tail cut off is still tough though.
Stray Demon
So confined and imposing that you really couldn't do anything more. Apparently it pisses people off a ton as is. Never saw it as very hard.
Taurus
Maybe spawn undead hollows on either side of the bridge. Something to keep you on your toes like that.
The Bed Of Chaos
Personally my least favorite fight, since it isn't a fight, but rather an extended platforming section, during which you need to continually run back to the boss if you miss. Perhaps some actual combat would be cool, such as having to fight capra demons while all this fire was going on, since the bed of chaos is the source of these demons.