宇 is a Japanese kanji written with 6 strokes, listed here under the keyword “eaves”. It is built from 宀 (roof) and 于 (potato). In Remembering the Kanji by James W. Heisig it is frame 1785.
On KumiJi Glyph Explorer, open the parts search and type “roof” + “potato”. 宇 is among the results, together with every other character containing the same shapes.
Open 宇 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.