Yeah, the guy I fought had LOTS of grass on him. We went back and forth forever. Part of my strategy is to light them on fire with a dragon axe and then go around the back. The constant spells spamming from him didn't make that easier. But I got him eventually :p
 
p.s. I think I read somewhere the claw guy is the offline default opponent?
 
My fave? ... Probably maneater. Following him around the dark night skies to see where he is landing next and then timing my next R1 roll is priceless.

Fighting that Tower Knight was awesome.

The False King was fun.  He made me put all my skills to use and I'm looking forward to fighting him again in NG+.  Sadly, my friend just beat him by sniping him before the fight started.
 
 
@joest01 said:

" p.s. I think I read somewhere the claw guy is the offline default opponent? "

 Maiden Astrea's fight was actually really sad 

I was scared out of my life when the Old Monk made me a Black Phantom. It was pretty awesome, though. I did have one problem-it was annoying that you could use healing items. It quickly became a fight for who had more healing items, and, because I store mine up when I really need them, I had none. So technically, I killed the dude 3 times and he killed me once-but he won.

"
After completeing the game yesterday, sadly through accidently taking the evil route, I've faced the majority of boss battles but each one has been an absolute beast of a battle and easily some of my favourite boss battles this year. 
 
"

Tower Knight via melee is pretty awesome.  The fight is far less of an adrenalin rush when you're shooting him from the ramparts.
 
Also, while it's pretty much a gimmick fight, the Dragon God was very cool just because of the sheer size and scale.

Tower Knight. The sense of scale, the music, the strategy when going at him with spears/swords and the constant "OH SHIT!!!" as he moves. And when he falls down... Man... so glorious. I felt like I had beaten the game when I beat him.

Penetrator is also pretty neat just by how insane his attacks are. Shame he's such a pushover. Storm King is also awesome. Most boss battles that came off as awesome for me really were the big-scale ones. The game pulls off that "This is too much for me!" feeling really well. The music and the arenas you fight the bosses in quickly establish a really strong atmosphere.

Man Eater was really hard for me. It forced me to get really good at my mellee skills and I grinded up to the Vicous Compound Long Bow +4. So far, Maneater was my favourite fight just because of how hard it was. Perhaps the Flame Lurker or w/e he's called would have been harder but I wanted to try out summoning so I did and the dude went and completly pwnd him.

" Man Eater was really hard for me. It forced me to get really good at my mellee skills and I grinded up to the Vicous Compound Long Bow +4. So far, Maneater was my favourite fight just because of how hard it was. Perhaps the Flame Lurker or w/e he's called would have been harder but I wanted to try out summoning so I did and the dude went and completly pwnd him. "

So far my favorite was the Penetrator. I don't know why. I really liked timing the dodges to his attacks. The fact that he had a one hit kill move was exhilarating too. The Dirty Goblin (Goblin? Colossus? Golem?) was an absolute joke, same with Leechmonger. I died the first time with Leech cuz I fell of the edge, but when I went back I took some fire arrows with me. My trusty Sticky Compound Long Bow +4 :P But don't even get me STARTED on how much I hate the Valley of Defilement...

Old King was the best.

Beating the tower knight up close and personal was pretty cool. Flamelurker was hectic and challenging but i found that one fun also.

Wait, what? The Old Monk battle was against an actual player? Mind blown.
 
I loved the Storm King battle as it reminded me of Shadow of the Colossus, but it was too easy.

how do you become the black phantom during the Old Monk battle?  I tried to go there after beating it but it wouldn't let me use my black stone.  When I fought the old monk I'm positive it was just he CPU because all it did was run at me the entire time.
 
Is that how some people have that big head wrap?  They were the blank phantom during that battle.
 
I beat the game but I feel I'm missing out on a lot of stuff.  I never got any magic, only miracles.  I have TONS of shards, stones, etc. that I never used because I never understood where those came into play.  I assumed you use them to upgrade weapons but they never let me use them to upgrade stuff.  I pretty much used the same armor the entire game that I got near the beginning of the game because I never found anything better.  Same with the weapon.  I only picked up one good sword the entire game.  The sword was good but it also drained my health, but I had a regeneration ring to counter it.  I got the soulbrant (think that is the name) at the end of the game which is better tho.  How do you get the other sword that was mentioned.  Do you let the Old One kill you?  I don't remember what it was called...demonbrant maybe?
 
edit:  Well I'm on my second playthrough and finally can get magic.  The first time I saved Sage Freke but the guy would always tell me to go away.

FlameLurker, probably because he was one of the few bosses that I got on my first try using straight up melee (went in unprepared, out of arrows and no attack spells memorized, I was so sure I was gonna die!). I've noticed though that the bosses get less and less impressive as you get further in the game, particularly the bosses in stage 5... But I'm on 1-4 now so hopefully the last boss makes up for it.
 
@handlas:
If you go into 3-x in soul mode and put down your stone to join another player's game, randomly you can be summoned by the monk, it happened to me once and I kicked the guy's ass with a Crescent Falchion right when he came through the door, I think he wasn't expecting to be attacked right away. And yes, that's how you get the crazy robe headwrap thing. I'm not sure if you have to win the fight to get it though.

" FlameLurker, probably because he was one of the few bosses that I got on my first try using straight up melee (went in unprepared, out of arrows and no attack spells memorized, I was so sure I was gonna die!). I've noticed though that the bosses get less and less impressive as you get further in the game, particularly the bosses in stage 5... But I'm on 1-4 now so hopefully the last boss makes up for it.
 
@handlas: If you go into 3-x in soul mode and put down your stone to join another player's game, randomly you can be summoned by the monk, it happened to me once and I kicked the guy's ass with a Crescent Falchion right when he came through the door, I think he wasn't expecting to be attacked right away. And yes, that's how you get the crazy robe headwrap thing. I'm not sure if you have to win the fight to get it though. "

The Penetrator was a pretty awesome boss fight. Especially since i forgot to free that dude that helps you fight him.
 

" I've noticed though that the bosses get less and less impressive as you get further in the game, particularly the bosses in stage 5... But I'm on 1-4 now so hopefully the last boss makes up for it.
  "

" @handlas: No, the one you would use to help another player, not the PVP one. I'm pretty sure you get it automatically after you beat 1-1... "

" The Penetrator was a pretty awesome boss fight. Especially since i forgot to free that dude that helps you fight him.

"

" Fighting that Tower Knight was awesome. "

3-3 Boss fight by far.  Probably one of my favorite parts of that game.

Finally killed the Maneaters on NG+ using Firestorm. A lucky shot would cut half their HP down with the Ring of Magical Sharpness equipped. Besides the False King I have the most challenge fighting those two.
 
As for the Maiden Astraea I went the hard way the first run through, killing Garl with my Dragon Longsword. But decided to snipe her directly in NG+. She pleas to you when you do it so it felt a bit messed up while I did it though.
Also Garl is susceptible to Death Cloud, I killed his Black Phantom form by just applying Death Cloud and shooting him with an arrow when he tries to heal.
 
The Penetrator goes down easily with ranged attacks, if you saved Biorr. Biorr helps you out with the fight if you do, and all you need to do is make Biorr do the tanking and you do the damage.
  
Black Phantoms are tougher than the bosses. I had the most challenge killing all of them during Halloween. A lot of them drop unique weapons, so it's definitely something to go after. Of course the Death Cloud method also works with them if you want the easy way out.
 
So I'll say any Black Phantom or the False King are my favorites. (Though I really hate to deal with Black Phantoms ever again!)

"

SPOILER WARNING: Click here to reveal hidden content.

Second time it was a total turn around when i owned some lightly armored guy who was using glorified fingernails aka the claw weapons =P 

  "

I didn't really have 1 specific boss that I liked the most. They were all fun and challenging.