Opinions on IV's (Long List)

So I'm going through my unit list, and I think I'm seeing mostly SI/merging fodder, but I thought I'd get opinions on ones I'm not sure about. Are these worth building up? (Fair warning: it's a long list. Tried to sort them by weapon type)

----Swords
3x Olivia: (-hp/+res) 2x(neutral)
Fir: (-spd/+atk)
2x Lon'Qu: (-spd/+hp) (-res/+spd)
3x Hana: (-atk/+spd) (neutral) (-def/+res)
3x Stahl: (-hp/+def) (-atk/+spd) (neutral)
----Lances
4x Sully: (-spd/+def) (-atk/+spd) (-hp/+res) (-res/+hp)
5x Gwendolyn: (-spd/+atk) (-def/+atk) (-res/+spd) 2x(-atk/+spd)
2x Effie: 2x(-spd/+hp)
2x Abel: (-hp/+def) (-atk/+hp)
5x Est: 2x(-hp/+spd) (-def/+spd) (-spd/+atk) (neutral)
7x Shanna: (-atk/+res) (-hp/+spd) (-res/+hp) 2x(-atk/+def) (-def/+atk) (-atk/+spd) >thinking she may be SI fodder anyway<2x
2x Cordelia: (-atk/+spd) (-def/+spd)
Florina: (-res/+def)
Oboro (-spd/+atk)
Subaki: (-atk/+res)
----Axes
Camilla: (-atk/+spd)
----Bows
Gordin: (-atk/+res)
Klein: (-spd/+def)
2x Setsuna: (-hp/+res) (-atk/+hp)
Niles: (neutral)
Jeorge: (-hp/+res)
----Daggers
2x Matthew: (-hp/+res) (neutral)
4x Felicia: (-def/+atk) 2x(neutral) (-hp/+spd)
Kagero: (-hp/+def)
----Red mage
Lilina: (-hp/+spd)
2x Sophia: (-hp/+spd) (neutral)
5x Henry: 2x(neutral) (-atk+def) (-atk/+res) (-hp/+def)
----Blue mage
3x Robin(M): (-res/+def) (-spd/+atk) (-res/+hp) (-spd/+hp)
----Green mage
Merric: (-spd/+def)
Nino: (calculator says +def/+res?)
----Healer
2x Lissa: (-spd/+hp) (neutral)
2x Azama: (-spd/+res) (-hp/+res)
----Dragon
3x Tiki(adult): 2x(-res/+def) (double boon/bane? -hp,atk/+def,res)
Nowi: (-def/+res)
2x Corrin(F): (-def/+spd) (-hp/+def) (-spd/+hp)

Ok, that's most of them. Holy smokes, that took forever. Thanks for any advice.