賊 is a Japanese kanji written with 13 strokes, listed here under the keyword “burglar”. It is built from 貝 (shellfish), 十 (ten) and 戈 (spear). In Remembering the Kanji by James W. Heisig it is frame 381.
On KumiJi Glyph Explorer, open the parts search and type “shellfish” + “ten” + “spear”. 賊 is among the results, together with every other character containing the same shapes.
Open 賊 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.