So I went through my list and checked which silvers I need for the various units I could Awaken just need to work out the pros and cons of each unit and what they could bring to my team.

Black:
Karma = Valkyrie + Healer + Vampire Hunter
Anya = Heavy Armour + Dragon Warrior + Samurai
Diene = Heavy + Heavy + Soldier
Saki = Rogue + Witch + Valkyrie

Plat:
Echidna = Mage + Healer + Dragon Warrior
Imrea = Barbarian + Samurai + Pirate
Shizuka = Samurai + Heavy + Mage
Lynn = Rogue + Barbarian + Soldier
Horace = Valkyrie + Mage + Soldier
Rita/Bashria = Archer + Archer + Pirate
Odette = Mage + Witch + Samurai
Chydis = Mage + Healer + Healer
Platinum Witch = Witch + Witch + Mage
Racheal = Pirate + Rogue + Barbarian
Shiho = Witch + Healer + Archer
Len = Archer + Mage + Pirate
Rika = Heavy + Monk + Pirate

Momento = Archer + Mage + Witch
Platinum Valkyrie = CC (Soldier+Heavy+Valkyrie)
Awk (Rogue+Heavy+Valkyrie)

Gold:
Cutrie = Rogue + Barbarian + Samurai

Mainly I need several Silver Mages they are the main thing that has held me back from awakening some units I would have done already it has been so bad I've been considering using some gold ones in place of the CC'd Silver. Apart from that I know that as long as we still need to use rogues as fodder to evolve other classes. (something that should eventually stop) that I will need a batch of those to... at least with the event being a star event their is no problem with farming the low area's unlike a Farm event where doing so would hinder your collection (Cost down + Skill Up) of the event unit.