@GGG - Do the mercs have their own curse limit? own totem limit or minions....?

Do the mercs share limits of different things with the player or are they their own separate entity?
Can we modify these limits with uniques or rares ...?

Players and Animate Guardian both have the same functional curse limit. Everyone has a default of 1 which can be increased. Whoever placed the last curse sets the limit. I see no reason why the Merc would deviate from this, but we'll have to wait a couple hours to find out.

Totem limits and the like aren't relevant for the AG, but since they are supposed to function as their own player, then there is absolutely no reason to think they wouldn't.

I'm interested to see if they are considered party members or just allies. I'm also interested to see if they have any sort of tree to work with since your clearly expected to be able to play a support character letting the Merc do all the damage.

Link = party member ?

(Half a party member for monster HP and loot too.)