[Traveller] Does Luck have to be PSI?

[Anthony]

Originally Posted by adimar

I have two questions:
1) Do I also need to take the unusual background(PSI)?

Only if the GM says you have to. In general, you don't have to take an unusual background if it's an ability you could buy without the UB.

Originally Posted by adimar

2) Does that character have a Secret? (I mean, he's a psi but he doesn't know it, make active use of it or train it)

Possibly; I forget what sort of psi detection is available in the Imperium. Again, ask your GM (in CT, you really couldn't have psi without knowing you had it, so this doesn't come up in canon).