1122. Why are these Katakana seen in a lot more characters? イ ヒ エ ヘ カ

Answer:

They are all radicals.

イ  The "Ninben" radical - person

ヒ  The "Saji" radical - spoon

エ  The "takumi" radical - work, carpenter, skill

ヘ  The "Hitoyane" radical - person

カ  The "Chikara" radical - power