With Legion being able to randomly produce new abilities what would Hope be able to if she mimicked his abilities?

O_O good question, it might be like a Rogue like thing where she can mimic the powers legion is currently using or her powers may allow her to access his full spectrum but i doubt that she could. 

I am sure Hope can copy whatever power Legion is using at the moment but right now the very nature of his powers are that he can only use them one at a time. Since Davids control over his powers seems to be psychological in nature
then perhaps with prolonged contact Hope could copy more of Davids abilities.