RHS of character, at same time
旁 centers on the idea of being alongside or beside something, both physically (the right-hand side of a character) and temporally (doing something at the same time).
旁 likely combines 方 (direction/side) with an upper element that may have indicated sound or meaning, but the exact historical development is uncertain.
The top part looks like a standing figure (立) under a cover (冖), and the bottom 方 points to the side. Imagine someone standing beside a cover, indicating the right-hand side or doing something alongside.
For ボウ, picture a bow tied to the side of a character: bow -> ボウ, and the bow is placed right alongside the main shape.
right-hand radical of a character
left and right kanji radicals
radicals of a kanji (left, right, crown and lower); kanji components
citing copious references
parametrium
kanji sun ("inch") radical at right (radical 41)
kanji "three" or "hair ornament" radical at right
kanji "spear" radical at right
kanji "strike" radical at right (radical 66)
while taking a walk
kanji "axe" radical at right
incidentally; at the same time
kanji radical 79 at right
kanji "seal" radical at right
kanji "brush" radical