Can you summon him while offline?
By the way, I had no problem being a soul in Demon's Souls. My problem was that online forced you into the PvP communal aspect. I want to play a game like this either alone or with others, not against others.
Didn't work, man. Solaire died in like 5 seconds when the other Gargoyle came out. I have to grind levels cuz it's a BS fight. I'm at Lv.22, btw.
Yeah, you can summon the NPC's offline (there are others - I just used Mildred on Quelaag and Witch Beatrice on Moonlight Butterfly and Solaire shows up for 3 or 4 battles, including the end one where he really makes a difference so you want to make sure you keep using him and "save" him in the later part of the game).
As for the Gargoyles, definitely make sure you get that sword from the dragon's tail, which is super easy to do. You probably need a good weapon at this point. Though I think I just used the winged spear (an old favorite from Demon's Souls) which you can get from down where the skeletons are below Firelink Shrine.
There is one HUGE advantage to staying online though, Broly - you will see lots of helpful messages about where treasures are, heads up on enemy ambushes, locations of secret (illusory) walls, etc. Playing offline feels empty and lonely in that regard. I would do it occasionally when I was really getting annoyed by invaders and needed to be human for summoning. But in a lot of places, you can summon help right near the bonfire, and then that person can help you deal with invaders.
Fire resistance gear isn't going to help much at all with the dragon in NG+ as it doesn't help any at all in NG when trying to beat him (I still have been unable to kill him even though I am near the end of NG). His inferno fire tower kills you instantly.
Well, fire resistant gear is the only thing that let me live long enough to get past him. And it made a difference when I switched out my regular leggings/gauntlets for the gold-hemmed ones with better fire resistance. You can get by his sweeping "inferno fire tower" by the way - I just did it last night. I was nearly dead and just rolled through it. Like I said before, I baited his attack from the right side, then ran across to the left and hugged the wall. I got blasted there and lost about 1/3 of my health (thanks to the gear and Flash Sweat). Then just as I got up and started the run animation I got knocked down again from his sweeping fire (since I was closer to him now) and lost nearly all the rest of my health. At this point I realized it was too slow to get back up and start the running animation. So I just started rolling at that point and made it through. Then, strangely enough, after I rested at the bonfire he was gone and I could stroll back out on the bridge and get those treasures which I don't think I got the first time (nothing special though).