宓 is a Chinese hanzi, listed here under the keyword “quiet”. It is built from 宀 (roof) and 必 (surely). It appears as a component in 4 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “roof” + “surely”. 宓 is among the results, together with every other character containing the same shapes.
Open 宓 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.