吸 is a Japanese kanji written with 6 strokes, listed here under the keyword “suck”. It is built from 及 (reach out) and 口 (mouth). In Remembering the Kanji by James W. Heisig it is frame 744.
On KumiJi Glyph Explorer, open the parts search and type “reach out” + “mouth”. 吸 is among the results, together with every other character containing the same shapes.
Open 吸 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.