So I've been playing for a while, not completely free as I did buy some SC a couple of times.

I'm currently at a point where I'm working towards Awakening units and would like a bit of advice on which units are really worth putting the time to level fully.

What I currently have (Cost/evolved/awakened)
Rogue
Betty (9)
Cuterie (9)
Cypria (10)
Ada (11)

Monk
Gina (10)

Sailor
Marie (Limit Value Evolved)

Archer
Shao (Limit Value Evolved)
Spica (14 Evolved)
Nanaly (16 Evolved) Feeding her all the armours I get, currently 50CC72

Soldier
Julian (12 Evolved)
Katie (13 Evolved)

Witch
Cloris (12)
Yuyu (14 Evolved)

Valkyrie
Kerry (15)
Clissa (17)

Pirate
Monica (15 Evolved)

Advanced Guard
Shuka (Limit Value)

Healer
Iris (19 Evolved)
Fedora (18 Evolved)
Camilla (21 Evolved)

Samurai
Chizuru (21 Evolved)
Momiji (22 Evolved)
Shizuka (21)

Magic Fencer
Charlotte (23)

Heavy
Bernice (25 Awakened)

Mage
Cyrus (30)
Barbastroff (35 Evolved)
Garania (31)
Sasha (31)

Princess
Themis (19)
Claudia (20)
Sybilla (21) Lv. 61

Bandit
Cellia (19 Evolved)

Ninja
Azami (19)

Angel
Sophie (19)

+ Assorted Silvers

This last star event was the first I was able to complete fully, so all of the previous ones I have are not min cost. As you can see I've sort of gone all over the place evolving random units here and there, so would really appreciate some direction on which units are really worth focusing on.

Current team I usually run is Katie,Nanaly,Yuyu,Monica,Iris,Sybilla,Barbastroff, Bernice, Fedora, Julian, Momiji, Camilla, Spica, Azami,Pallis (Silver mage).