tick, mite
蜱 centers on small parasitic arachnids: ticks and mites. Both meanings refer to tiny blood-feeding or skin-burrowing creatures.
蜱 combines 虫 (insect) with 卑, which likely contributes the sound. The character is used for ticks and mites, small creatures classified with insects in traditional Chinese taxonomy.
The insect radical 虫 on the left hints at a small creature, and the right side 卑 looks like a lowly, clinging shape. Picture a tick or mite as a lowly insect that clings to skin.
For ヒ, imagine a tick making a tiny high-pitched 'hee' sound as it bites: hee -> ヒ, and the insect radical 虫 reminds you it's a bug.
white mite (Tarsonemidae spp.); thread-footed mite
house dust mite (Dermatophagoides spp.)
Ixodes ovatus (species of tick)
erythaeid mite (Erythraeoidea spp.)
mould mite (Tyrophagus putrescentiae); cheese mite
prune mite (Carpoglyphus lactis); sugar mite
moss mite (Oribatida spp.); box mite; beetle mite; oribatid mite
chicken mite (Dermanyssus gallinae)