Barbarian Ninjas!
I think it would depend upon specific use. Basic uses of ki could probably be allowed, more advanced would depend upon type of ability activated - vanishing trick and other spell duplicating ki uses would be a no, for example.
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as raw yes they can, if this were 3.5 you wouldnt because they said you could not use anything using int, wis, or cha while raging.
so yes you can monk/barbarian or rogue/barbarian.
and fyi a rogue barbarian with furious finish,and vital strike is a beast... my god.
Actually, I was thinking a Wild Rager Barbarian / Ninja using a Composite Longbow. With all the proper feats/buffs, you could be looking at a rager who can fling out 7 arrows (6 attacks) in a full attack by a mere +6 BAB. It would look something like this:
______________________________-3 to all attack rolls (-2 from Wild Fighting, -2 Rapid Fire, +1 from Haste)
+3(2 Arrows via manyshot)/
+3(Wild Fighting)/
+3(Extra Attack from 1 expended Ki Point)/
+3(Haste)/
+3(Rapid Shot)/
-2(Iterative Attack due to +6 BAB)
______________________________
Oh, sure, it doesn't look like it's worth it. But consider a high dex mod, weapon focus, perhaps a small character, magic items, etc., this -4 to attack rolls is easily overcome.