183. This #kanjipuzzle is about evolution. Start with one character, add a few strokes, and get another, then repeat.  一->?->?->?->?->?->電

Answer:

一  ICHI, ITSU, hito(tsu) - one

丁  CHOU, TEI - counter, block

干  KAN, hi(ru), ho(su) - get dry, dry, drink up

雨  U, ame - rain

雪  SETSU, yuki - snow

雷  RAI, kaminari - thunder

電  DEN - electricity