How's the Conjurer so far? I read about the Pokemon master build in the forum but some people have mentioned it's not viable at Ultimate difficulty.
As a pet build, it's been working pretty well on Normal/Veteran difficulty. The pets carve up enemies pretty effectively while I support with Curse of Frailty and Wendigo Totem. Devotion procs work quite nicely on pets too - I have the Eye proc on the Hellhound and with his fairly high attack speed he's often got 4-5 eyes floating around him during combat. Pets don't hold aggro at all though despite them having skills with taunt elements; if I do *anything* that affects an enemy, nearly all of them will ignore the pets and come straight at me. Wendigo usually keeps me up when that happens though, outside of certain bosses and large/multiple spawns.
I've not run much of Elite yet , but it seems a lot rougher - the pets still do just as well (if anything, they are more survivable than before), but my actual character isn't able to stay in melee the way I could in Normal. I'm gonna put some points in Primal Bond for some damage absorption to hopefully help with that, but I can definitely believe that I'll struggle in Ultimate.
My current build:
http://grimcalc.com/build/YKxCgL(Vines, Sigil, and Pox are just to trigger devotion procs, the rest I plan to put more points into)
I'm not aware of any items scaling with player character, but it's not something that I've thought to look into. I know you get 'Empowered' versions of the Blue items at higher levels with better stats though.