good, honest, simple, respectful
顓 centers on a person's character being straightforward and worthy of respect: honest, simple, and good in a way that invites deference.
顓 combines 耑 (which may relate to a sprout or beginning) with 頁 (head), possibly suggesting a person of upright character or one who is first in virtue. The exact historical development is uncertain.
The left side 耑 looks like a sprout growing straight up, and the right side 頁 is a head. Imagine a person whose head is as upright and simple as a young sprout: honest and respectful.
For セン, picture a simple, honest person bowing respectfully while holding a single sen coin (銭, せん) as a humble offering: sen -> セン.