barbarian
蠻 centers on the concept of a barbarian: an uncivilized outsider, often associated with southern tribes in historical Chinese contexts.
蠻 combines 虫 (insect/reptile) with 䜌 (a phonetic component), historically used to refer to southern 'barbarian' tribes, possibly with a derogatory insect association.
The top 䜌 looks like a tangled mess of threads and words, while the bottom 虫 suggests a lowly creature. Together, they paint a picture of an uncivilized outsider—a barbarian—as someone tangled and base.
For バン, imagine a barbarian swinging a heavy ban (バン) like a club, shouting wildly. The sound of the ban echoes the reading.