Re: Aegis Thousand Year War - DMM Online Game
Here is the short list:
Obtained at min-cost.
Not the best, but serviceable and usable post-AW.
It is required to awaken her, otherwise she is as good as a Silver/Gold Princess.
Slightly slower attack speed.
Skill has a low duration and it requires Rainbow Fairies.
Not meant for higher difficulty bosses (Golem-tier and above; the same can be said for most of the princess except Sybilla, Lilia, and maybe Louise)
Lack of matching fairies can make her difficult to raise.
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Kaguya is on the lowest tier of Princess pre-AW. The lowest tier has the newcomer Silver Princess Rosette, and long-time veteran Gold Princess Themis. All 3 of them have similar stats and the same attack speed. Kaguya could've been worse than those two if not for her very good affection bonuses.
Kaguya is on a similar tier as the Premium Platinum Princesses post-AW, but falls slightly short because of non-Premium status. She has a slower attack speed (37 frames, 1 frame faster than Claudia), which does not improve after awakening. It is even more noticeable when you compare her attack speed to an awakened Premium Princess (33 frames).
One issue with Kaguya is her skill. It has 10 levels and the only way to upgrade it is through multiple LN serial codes or Rainbow Fairies. At the lowest level, it has a 5 second duration and it boosts her attack by 2x. At the highest level, it's duration becomes 15 seconds and boosts her attack by 3x. It's charge time is also long so she will have to be deployed early for it to be ready in time against a difficult enemy. You also won't be using it really often because of it's long cooldown as well. 3x attack is great because she deals magical damage, but there's a limit on who she can fight against. Knowing who she can fight against will help a lot because of her less than average HP (for Princesses).
If you don't have any other Princess, then you can use Kaguya since you probably won't get anything better for a while (or a long time). If you have a better Princess, then you won't find much use for her unless you need multiple Princesses. You will still need to find a stronger Ace Duelist if you want a chance against very high-tier bosses.
You can use Hikage, the Sapphire Maid to boost her stats (5% pre-AW, 10% post-AW), but then you are sacrificing a slot to boost only 1 unit. At the very least her cost is reduced by 2, making her a very cheap Princess to deploy.