鲁 is a simplified Chinese hanzi, listed here under the keyword “foolish”. It is built from 鱼 (fish) and 日 (sun). It appears as a component in 7 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “fish” + “sun”. 鲁 is among the results, together with every other character containing the same shapes.
Open 鲁 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.