Never had any dimensional, is it safe to link it with any ofbmy heros

Hi guys, As the title says, i have never had any dimensional before (and still don't) and want to use robin hood for next couple days when he is available for free. The thing is that i don't know if there is a risk for my heros (linked to the dimensional heros) to "lose" something or else.

Just simply put, any risk concerning the heros to the dims ?

Thanks a lot