[@Aro]
If Vega decides that he wants to remain a hero. lol
Impulse was a hero and Impulse got his mom killed. This tale is a darker one.
Adrian as Impulse was optimistic and ignorant about the consequences that come with stopping villains.
After the death of his mom, he only cares about one thing. This jaded and bitter outlook on life has tipped Adrian's alignment more towards neutral. His interactions with the other characters could turn him more jaded or could talk some sense into him and renew his heroic tendencies.
Either way, Adrian is going to become Vega and develop his new ability and Impulse will be left in the past.

[@The Kid Lantern]
After some time passes and Vega has a costume and some combat sense, I wouldn't mind allowing Vega to suffer from crippling hopelessness and depression. He may come out of the shadows and take his frustration and anguish out on the city. If this sounds interesting, I think that this would be a good time for Sea Snake and Vega to meet and have an epic battle. At the end, Sea Snakes' youthful/optimistic attitude could win back Vega onto the right side, or at least knock some sense into him and remind him what it means to be a hero. ;)