These emojis use character ω (omega) for mouths of their emoticons.

Happy kaomoji
(* ^ ω ^)(´ ∀ ` *)٩(◕‿◕。)۶☆*:.。.o(≧▽≦)o.。.:*☆
(o^▽^o)(⌒▽⌒)☆<( ̄︶ ̄)>。.:☆*:・'(*⌒―⌒*)))
ヽ(・∀・)ノ(´。• ω •。`)( ̄ω ̄)`;:゛;`;・(°ε° )
(o・ω・o)(@^◡^)ヽ(*・ω・)ノ(o_ _)ノ彡☆
(^人^)(o´▽`o)(´▽`)。゚( ゚^∀^゚)゚。
( ´ ω ` )(((o(°▽°)o)))(≧◡≦)(o´∀`o)
(´• ω •`)(^▽^)(⌒ω⌒)∑d(°∀°d)
╰(▔∀▔)╯(─‿‿─)(^‿^)ヽ(o^ ^o)ノ
(✯◡✯)(◕‿◕)(≧ω≦)(☆▽☆)
(⌒‿⌒)\(≧▽≦)/ヽ(o^▽^o)ノ☆ ~(‘▽^人)
(°▽°)٩(。•́‿•̀。)۶(✧ω✧)ヽ(⌒▽⌒)ノ
(´。• ᵕ •。`)( ´ ▽ ` )( ̄▽ ̄)╰(´︶`)╯
ヽ(>∀<☆)ノo(≧▽≦)o(☆ω☆)(っ˘ω˘ς )
\( ̄▽ ̄)/(¯︶¯)\(^▽^)/٩(◕‿◕)۶
(o˘◡˘o)\(★ω★)/\(^ヮ^)/(〃^▽^〃)
(╯✧▽✧)╯o(>ω<)oo( ❛ᴗ❛ )o。゚(TヮT)゚。
( ‾́ ◡ ‾́ )(ノ´ヮ`)ノ*: ・゚(b ᵔ▽ᵔ)b(๑˃ᴗ˂)ﻭ
(๑˘︶˘๑)( ˙꒳​˙ )(*꒦ິ꒳꒦ີ)°˖✧◝(⁰▿⁰)◜✧˖°
(´・ᴗ・ ` )(ノ◕ヮ◕)ノ*:・゚✧(„• ֊ •„)(.❛ ᴗ ❛.)
(⁀ᗢ⁀)(¬‿¬ )(¬‿¬ )(* ̄▽ ̄)b
( ˙▿˙ )(¯▿¯)