Leveled up before tackling first king (lvl 30 keeping Hirado & Karine and getting first martial arts training) in normal mode.
1-Scorpion King - 1st. Needed Hirado's white orb.
2-Imp King - 3rd. Waited until got to lvl 40 (2nd martial arts training & all charms for spell)
3-Queen Twin - 6th. (like the bear in MM1 only because of high leveling 40-45)
4-Lion King - 5th. (because of high leveling 45-50)
5-Ooze King - 4th. (Ha! Lvl 50+ before coming across this one)
6-Gorilla King - 2nd. Even waiting for high leveling, not easy.
Gigantine was actually the toughest for me

I could avoid the Kings until I was good and ready with all my reviving supplies and earned leveling spells
