KanjiJLPT N2
Faction

faction, group, party, clique, sect, school

Mnemonic

A massive storm rolls in and a fork of lightning splits the sky clean in two — one bolt veers left, the other right. This is exactly how a faction forms: a single strike of disagreement forks the group apart, each side storming off on its own divergent path.
Additional thoughts
Picture the fork of lightning literally dividing a crowd standing in a storm — half scatter one way, half the other. The visual of splitting energy mirrors how factions splinter from a larger body.
Quick recall
A storm's fork of lightning splits a group into a rival faction.

Details

The keyword for 派 is faction. This kanji refers to a group of people who share common beliefs, opinions, or interests, often within a larger organization or political body. It carries the sense of a branch or offshoot that splits from a main body, much like a tributary diverging from a river. By extension, it is also used to describe schools of thought, styles, or sects that distinguish themselves from the mainstream.
On'yomi