Two blasters can do well together. If you're worried about keeping the bad guys away, the Ice secondary has a nice selection of control powers (immobilizes, slows and holds) for some pseudo-controller action.
Otherwise, Defender/Controller would work just fine. With the new buffs to Vigilance, your Defender would still get a 20% buff to their damage provided you guys plan to mostly duo. I'd personally probably not choose a controller unless you plan to either team a lot or run missions at a higher crowd level than average just because I wouldn't find the "crowd control" worth it for five bad guys at a time. That's not to say a controller would be a bad choice -- I just like playing my controller the most when I'm locking down massive swarms of villains, not just a couple guys. Also, controllers don't really start dealing decent damage until later in the game so you might find it unrewarding until then.
Personally, I'd go */Ice blaster or a Defender. Probably Dark/Sonic. A nice combination of utility from Dark (Heal, slows, debuffs, holds) and damage from Sonic.
My personal choice if I could have a duo partner for my blasters would be;
Another Blaster - Nothing beats more damage. I'd say Fire/Ice for the added mitigation in /Ice and the added AOE's of your combined Firepowers.
I'd rather have a controller than a defender. Just because as a duo you won't need the massive buffs avail to defenders and you can benefit from the holds/ immobs.
My choice would be either
Ill/Empathy
Fire/Rad
Fire/FF
Really anything will mesh well with a Fire/MM blaster.
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Earth/Thermal. Every support ability a blaster could ever wish for (besides recovery buffs) and at 32 a pocket tank gets invited to the party.
I recently got my wife involved in COH and she is going ot make a Fire/MM blaster. What could I make that would have synergy with her build to help her along? Having a few blasters myself that is the archetype I am used to playing, but I do not know if 2 blasters running together would mesh well. I have no interest in playing a tank, or even a scrapper for that matter, so what else could I consider?
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