All of the following help content is also in the "/cuteplayerchat help":
/cuteplaychat help
Query your own or other players' chat prefix or suffix:
/getpre|getsuf [playerName_1] ... [playerName_n]
Query all players' chat prefixes or suffixes:
/getpreall|getsufall
Change your own or other players' chat prefix or suffix:
/setpre|setsuf [playerName_1] ... [playerName_n] <prefix>|<suffix>
Change all players' chat prefixes or suffixes:
/setpreall|setsufall <prefix>|<suffix>
Delete your own or other players' chat prefix or suffix:
/delpre|delsuf [playerName_1] ... [playerName_n]
Delete all players' chat prefixes or suffixes:
/delpreall|delsufall
In the future, more ways to modify the chat messages of players will be added to achieve the effect of making any player's chat message more cute and lovely.