flourishing, successful, beautiful, vigorous
旺 centers on vibrant, thriving energy: flourishing, vigorous growth, or striking beauty that comes from being full of life and success.
旺 combines 日 (sun) with 王 (king), suggesting the radiant, powerful energy of a king under the sun. The exact historical development is uncertain, but the component choice clearly conveys brightness and strength.
The sun 日 shines beside a king 王, making everything around him flourish with vigorous, beautiful success.
For オウ, imagine a king flourishing under the sun while wearing a golden crown that gleams like the sound "oh": oh -> オウ, and his kingdom thrives.
lively; vigorous; energetic; healthy; avid (e.g. desire); rich (e.g. imagination)
Oubunsha (publisher)
brimming with vitality; full of vigor; full of life
morale being very high; heightened fighting spirit
brimming with curiosity
prosperous
being full of energy (drive, motivation, vitality)
voracious; having a hearty appetite