That’s a good one @meiadeleite !
And this is a great question. I hope many participate so we can learn from each other.
For 戴 when I discovered that 𢦏 actually means “wounded” and 異 means “strange” , I came up with the mnemonic “wounded strange you will be if you do not WEAR your halberd“
But my favourite character component/radical of all time is 隹，the short-tailed bird. This little bird appears repeatedly and is quite a busy “character” making mnemonics easier.
The short-tailed bird causes endless DIFFICULTIES for the yellow-loam person (堇 and 人 in 難）, knows how to SELL with his mouth in 售，is terrified of claws tiny and big because it is only a CHICKEN in 雞，ENTERS by walking in 進，when noisy in the grass is a HERON in 雚，PUSHES with its hand in 推，speech(less) in the grass it PROTECTS itself again in 護，there’s a SINGLE one in 隻，and a PAIR of them again in 雙，uses earth to PILE UP STACKS in 堆 … and then there’s “WHO? WHO? said the short-tailed bird” in 誰。
I find mnemonics at times more difficult to generate for simplified characters because when the character components are not just simpler versions of complex components, but made up of almost random strokes I assume were taken from handwriting shortcuts, there’s often nothing to base them on except “slash left” or “dot” or “vertical line.” Such as 龙 （hand 𠂇 seven 七 dot丶What to make of this?? (Except maybe: “by hand I count seven dots on the DRAGON” I guess)
Happy mnemonics-making everybody.