KANJI GUIDE
The sky, and heaven with it. 天国 is paradise; 天気 is the weather.
A made-in-Japan character: rain, and under it, down. One drop coming off the edge.
A dream, both the sleeping kind and the wanting kind. 夢中 is being lost in something.
Long life, and the celebration of it. The character on wedding envelopes and New Year food.