Can Iden target herself with her ability?

Yes.

2 hours ago, thespaceinvader said:

Yes.

Same goes for Valen Rudor!

And iden can stop all damage ore just one?

Ex, if someone shoots at her and hits 3 damage, she stops one or all three?

All of it.

Note that it doesn't prevent ion, etc. from e.g. ion cannons (but it will still stop any normal damage, but since those weapons can't do crits you probably won't use it on them).

13 hours ago, Jaden Corr said:

Same goes for Valen Rudor!

what? Valen rudor is only for himself, can't pass on that action to someone else...
unless..... squad leader maybe...

39 minutes ago, DarthSempai said:

what? Valen rudor is only for himself, can't pass on that action to someone else...
unless..... squad leader maybe...

They mean that he also triggers his extra action when he defends as well as squad mates at range 0-1 when they defend.

2 hours ago, Hiemfire said:

They mean that he also triggers his extra action when he defends as well as squad mates at range 0-1 when they defend.

This is indeed what I meant. Perhaps should have made myself clearer.