143

143 is a recurring number in OMORI.

Appearances

Appearance	Description
Something in the Dark	If Sunny fails to use Calm Down after learning it, then Something in the Dark will attack Sunny on the tenth turn for 143 of damage, instantly killing him.^[1]
Something (enemy)	After Something is revealed to be a hanging Mari, it will begin dealing 143 of damage every turn.
Overcome	There are two versions of the Overcome skill. The normal one obtained in the Something fight does exactly 143 of damage, although this cannot be seen under normal circumstances; the battle ends after Sunny opens his eyes. The unused variant that "does big damage to an enemy" also deals exactly 143 of damage.
WTF Value	The number assigned to the variable for WTF Value is 143.
Wolf	A NPC located in the Last Resort, if Hero is tagged, will thank him for saving his marriage before giving the team 143 clams.
Backyard Area	After Something begins following Omori, collect the key and wait. After 143 seconds, he will be able to jump off the right ledge into the Water Walkway.
Doombox	If a Doombox is defeated while it is Neutral, Omori's party will gain exactly 143 EXP. Notably, Doomboxes will instead give 142 EXP if defeated while Happy, making it the only enemy in the game that rewards a different amount of EXP when Happy compared to Neutral.

In the phrase "I love you", "I" has 1 character, "love" has 4 characters, and "you" has 3 characters.

The Minots Ledge Light flashes in a 1-4-3 pattern, and was nicknamed "I Love You", appearing to be one of the earliest dated uses of 143 in this manner.
143 is additionally used as shorthand for "I Love You" on pagers.

In the Backyard Area, where Omori must wait 143 seconds to proceed to the Water Walkway, Something will say "Sunny... I love you..." every ten seconds.
In the Last Resort, Wolf will mention his marriage before offering the team 143 clams, a further tie-in to it's meaning in relation to love.

The number is strongly associated with Something, or Something-related sightings.