Re: Why can't Mei Terumi use Mokuton?
You need to be naturally born and gifted with those two elements being merged by birth, which is why it's called Kekkei Genkai. Me, on the other hand, was gifted to be able to combine only two of those three affinity mentioned. It is a special bloodline that combines both, which is why it cannot be copied because it's imprinted in their DNA by default. Much like how Uchiha's eyes Haku's ice, it's only passed down by genetics to have that in you.
Originally Posted by Megatolium
With Mei, again, she was born with the affinity of Earth+Fire & Water+Fire. I suppose Kishi didn't want others having such a rare gift, so she gave Mei other awesome classifications
Yoton - > Lava Release
Originally Posted by Shika88
Futton -> Mist Release
OffTopic: Yeah! Go Mei Terumi! She's my favorite too ;D haha