What Immortal should I get? (I have Dragon, Mama, Hailey)

Wow, it's been so long I don't remember. You seem to remember everything though.

Pulse or Meow

Seeing as you're going with Madil, I recommend Hailey for the first Immortal, Mama for the second, Miya for the third, Pulse for the fourth, and Dragon for the fifth.

Bamba

Ato

Don't people usually raise Ato if they have a ninja?

Let's go with the cat method!

For Hailey, since she has Mama up to level 6, I recommend Pulse. Also, I recommend the Big Cat skill after Meow or Frog~ For reference, if you go with Frog, I recommend Mama up to level 12.

Bat Pulse