This is general not just FMA,
Well, I have been playing the New Dragonball Z game...
As some people know:
Armstrong: piccolo
Broly: Ed
Um... thinking of DBZ
And always of Negima, My favorite Anime Ever...
Ayaka:Trunks
And Fma...
Yue:Nina Tucker
Um... whatelse?
Nouta(FLCL):the grandma from the prince of tennis
um,
This kid from trinity blood: Al(FMA)
Also, I have shown interest in jappanize too,
I love
Yue(Negima), Kanako(Love Hina), and Fiora(Crono crusade)
All dubbed by the same person, By accendent(kills all who disagree)
Anything else Interesting?

There is actually a bunch of VA's who do a lot of different vioce jobs. specially the guys from Dragon Ball Z most of them went on to do bigger and better things. Also Vioce actors from Inuyasha like the vioces of Miroku and Narako does a lot of talented vioce work. And if you notice, the same people who do the little vioces of side roles in anime such as the vioce of ayase from S-cry-ed also does other small roles in other anime like Carmen 99 from Gun Sword untill they have a break out role that elevates them.

yeah accually, I remember that alot of bit parts are from VA's that have done main character roles to many ofther popular Animes.