[jopjopjop]

Originally Posted by Chris38

Akeno - using her Fallen Angel mode without the bracelet that Azazel has given her ... along with some improvements to her Lightning Dragon ability, where it will be capable of containing some more elements then just Lightning.

Gasper - improving the length of his Balor mode + learning a few more Balor related abilities

Akeno can already use other elements as early as Vol.14.

Spoiler for Akeno in Volume 17.:

She doesn't need the bracelet anymore.

Spoiler for Gasper in Volume 17.:

I don't think he has problems with the length of using Balor mode since in that battle he was in Balor mode the whole fight; supporting the group and fighting the mass-produced Evil Dragons. Although he was seen asleep after the fight.