Method to Acquire - By the end of Chapter 16x or Chapter 16 if Douglas died in that, your Pegasus Knights/FalcoKnights have to be higher on levels then your Nomads/Nomadic troopers. Then on Chapter 20, speak to her with Zealot to recruit her.
Damage - It's horrible. You'll be lucky if you can deal ANY damage at all since she starts with 11 strength.
Critical - The Triangle Attack has a 100% chance to critical. However, that won't do much good if you can't deal any damage. It is nice to position her and let Tate or Thany do the critical though.
Speed - She starts with 16 speed, so you'll be lucky if you aren't being hit twice.
Dodge - Not very high. Yunno starts with 8 defense, and 12 resistence, so her low dodge doesn't help her at all.
Growth Rates
HP - 50%
Strength - 20%
Skill - 35%
Speed - 30%
Defense - 10%
Resistence - 10%
Luck - 45%
Average Level 20 FalcoKnight Yunno
HP - 39
Strength - 13
Skill - 18
Speed - 19
Defense - 9
Resistence - 13
Luck - 19
Total - 130
Supports
Tate - 10/20/27 turns
Thany - 10/20/27 turns
Zealot - 7/20/27 turns
Treck - 40/60/80 turns
Noah - 40/60/80 turns
Rating - 3/10. She starts off worse then Dayan and with only slightly less sucky growth rates.