Heero and Trowa?
There's certainly opportunity within the series for these two to have a meeting of the minds. But what kind of pair would they be? Both of them are inclined to be silent unless speaking is absolutely necessary - then again, they seem to understand each other on a non-verbal level. It's possible that they communicate more with a glance, a raised eyebrow, a subtle curve of a smile, than they ever could with words. ^_~ And hey, they don't have to worry about what to do if they go deaf in their old age. ^_~