WHOLE CHARACTER
喜xǐ
happy; glad; to be fond of (喜欢); a happy event; wedding joy (喜事); pregnancy (有喜)
喜 is joy — being glad, liking things, and wedding-day happiness.
The modern form is shown completely: the drum-stand top 壴 over the mouth radical 口. ZDIC marks 会意 without naming pieces in the extracted entry.
TOP PIECE (壴, A DRUM ON A STAND IN DICTIONARIES)
壴zhù
a drum on a stand (archaic)
An archaic dictionary graph; in 喜 it is the written top piece with no claimed historical role.
In 喜: top piece (壴, a drum on a stand in dictionaries) Shown with its documented or clearly limited role.
BOTTOM MOUTH PIECE (THE RADICAL 口)
口kǒu
mouth; opening
Mouth/speech/opening clue; may also be a repeated visual element.
In 喜: bottom mouth piece (the radical 口) ZDIC lists 口 as the radical.