If you see a grassy cliff with an elf under it in winter, it's because their parents are so strict. When elf kids misbehave they're supposed to go stand under grassy cliffs to think about what they've done.
One of the strict parents of this elf kid is... Genji (げん)?! Looks like he had another illegitimate kid... this time with an elf.
Currently there are no similar looking kanji which exist in the WaniKani learning system