Red insects only bite barbarians. If a red insect bites you then you have barbarian blood! Waaay back a barbarian was your aunt or uncle or great great grand pappy! But the insects kinda hurt, so it's a bit of a downside I guess.
You follow the red insect and see it bite someone who must be a barbarian! You look up at their face but all you can see are giant Ray-Ban (ばん) sunglasses. You really want to look at his face to see what a barbarian looks like but those darn things are in the way!
Currently there are no similar looking kanji which exist in the WaniKani learning system