か
ひ, ほ
None
The fire radical and the fire kanji are the same as each other.
Whenever we need to remember か, we use the word car.
For this kanji, when we think fire, we ought to think of something on fire. What's on fire? It's obviously your very own car (か)! Oh Goddd NOOO!
Currently there are no similar looking kanji which exist in the WaniKani learning system