I had some bad luck getting these two FEH units, but I did get them. I spent 120 single vouchers, 13 tenfold vouchers, and 10k wrymite and got:
Mitsuba
Valerio
Siren
2 Chrom
Epidmetheous
Naveed (dupe)
Peony
I still have 40k wrymite left, but with this luck I hope I have better luck getting Tiki