The game have a new dlc
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Should already be in the download. Can get the ginger/redhead on turn 14, and she's really useful for your MGC line.
After a while, I found that focusing on a single lineage, and only branching out when I specifically need a certain magic combination, actually led to better stats for my goblins overall.
Apparently, having a lineage solely focused on power-leveling stats really helped improve overall Goblin quality.
Also, I'm not sure if it was mentioned here, but the Tower gives permanent stat boosts on the first clear for every 10 levels, and that clear resets every run, so I've been able to farm permanent stats by going through the first 20-30 levels and then go for the Sayuki + Hibiki ending to avoid a defense wipeout (imo, that's the easiest ending to get without having to go through Zoe). I've got +6-8 stats for everything from that alone (although this is only good early/mid game, since I'm reaching the limit of the lower-level magic).
As a side note, is anyone else having trouble getting CMD from the Adventure Tower? Or is it perhaps only given from clearing the upper floors?
Edit: I was wrong. There is a CMD buff on every 10 floors, 30 and above.
The stats from tower are random, imo; I got a +1 CMD after clearing the floor 10 on a new game. Useful, but too much CMD is annoying (kills my fodder too quickly).
And as Thai mentioned, plus I personally believe, it's better to go through the game first. Both the tower and game are easy enough to clear, if you can get a good line going, and higher levels give better foodstuff. I didn't have much trouble with any of the gals, besides Asteria, while starting fresh, and it was thanks to the tower and planning the line. Some advice:
1. Retreating can be useful; and allow you to slowly pick off the heroine group.
2. It's better to take it slow at the start, to build up some fodder gobs.
3. The other goblin types give different bonuses (With the Tower one being really useful). Not sure what they all give, but goblins allow you to loot, and the tower ones increase Atk or Mgc.
PS. The first page, linked walkthrough should really be updated; imo, it's better to farm tower, once you get some units better than green goblins. Even starting out, you can clear a couple levels there, which will give you more food.
Edit: Huh, seems you don't need to NG+ to be Asteria; just needa focus the stats and continue feeding. Though, guess that's why challenge mode exists, but it's till hard due to no Tower to farm food.