If we get a new Scion/Archon...What should he/she be like?

[Remus]

I believe Aranvald has the blessing, or it becoming implied. These past 2 patches were in Doma so he wasn't involved, but he was pushed forward a lot in the 4.1 story.

As for a new Scion, or a new main character in general, we need a male miqo'te, that is the only gender/race that hasn't been a main character yet. All of the others have been.

Aranvald only has the Echo. The only person who has the Blessing of Light is the Warrior of Light. In order to get the Blessing of Light you need to obtain Crystals of Light.