White Ninja is a good one, but if you are looking for good ninjas for an Ultimate Insect build, the best one's are:
Ninja Grandmaster Sasuke; he's the biggest ninja; gets LV7
White Ninja; destroys Monsters; gets LV7
Lady Ninja Yae; great synergy with the Ultimate Insects; gets LV 5
Crimson Ninja; extra Trap destroyer; gets LV3
Armed Ninja; extra Spell destroyer; gets LV3
Each of these can get at least one level of Ultimate Insect out of the deck by using Ninjitsu Art of Transformation. I'd suggest the following loadout:
Monsters:
Ninja Grandmaster Sasuke x3
White Ninja x2
Lady Ninja Yae x2
Crimson Ninja x2
Armed Ninja x1
Ultimate Insect LV3 x2
Ultimate Insect LV5 x2
Ultimate Insect LV7 x2
Sangan
Exiled Force x2
Spells:
Premature Burial
Heavy Storm
Mystical Space Typhoon
Reinforcement of the Army x2
Pot of Avarice
Insect Imitation x2
etc.
Traps:
Ninjitsu Art of Transformation x2(3)
Call of the Haunted
etc.
You get the idea. I know you wanted to do something with the Armed Dragons too, but trust me, stick with one family of "LV"s at a time.