Yellow - Onatel. Her mana control is ON POINT. she’s beast in raids & is mega helpful to complete challenge events & atlantis stages, especially when paired with Proteus. I’ve got some videos of the two in action together if you’re interested.
I’d also probably vote Inari over Neith… Just cause Neith seems more scattershot… Not really focused. Inari on the other hand is tile-damage focused. Best Yellow Attack stat available.
Blue - Go with Frida here. You don’t yet have a maxed elemental debuffer. Added to that you don’t yet have a 5* sink for Paladin emblems and she’s the way to go.
Your Options, just to type it out so its clear
Yellows: Ranvir (4/80), Joon (4/80), Inari (1/1), Neith (1/1), Onatel (1/1)
Blues: Isarnia (4/80), Magni (4/80), Frida (3/70), Vela (1/1)
Purple: Kunchen (4/80), Khiona (4/80),
Green: Evelyn (4/80), Lianna (4/80),
Red: Azlar (4/80), Marjana (4/80)