I'd say grab Bael for your Dark team, she adds a "dark" mirror to Evangaline's role in the light team in being offensive support, not to mention she is Samael, which lets you make a solid Sameal team.
For the Light team I'd grab either Claire or Daniella, both offer more mobility to the light starter, and Claire is offensive to Kronen's defensive, while Daniella is long range to Kronen's short.
If you feel like it, you could grab both.
Derreck Shezzard is a good Nuetral, as he is a powerhouse, but Tsubasa is another solid choice, as is Faust, any one of those would work.
Dark: Bael (Status)
Light: Claire (Offensive) and/or Daniella (Ranged)
Nuetral: Derreck Shezzard (Powerhouse), Tsubasa (Flexible), or Faust (Anti-armor Powerhouse)
Kairos and Azriel are also personal favorites of mine on the Dark side, Kairos is also Samael(like Bael, Ayl, and Chesire), while Azriel is Church(like Evangaline).
When considering models for Light or Dark, consider their factions, as some Dark/Light characters are the same faction, and thus can form a faction team. (Janiela and Aoi are Samael, and mesh well with the Dark members of the same Faction).
It is also up to personal tastes in models, but these are just some of my favorites.