Cats are pretty much just most regular Japanese emoticons with =’s added to them as whiskers. ^’s can also be used for ears and you can use ・ェ・ for a cat’s nose.

 

(ΦωΦ)( =①ω①=)(^-人-^)
(^・ω・^ )(=;ェ;=)(=^-ω-^=)
(=^・ω・^)y=~(=^‥^)_旦~ヽ(^‥^=ゞ)
b(=^‥^=)o=^● ⋏ ●^==’①。①’=
。^・ェ・^。( ^..^)ノ(・∀・)
(.=^・ェ・^=)((≡^⚲͜^≡))((ΦωΦ))
(*ΦωΦ*)(^・o・^)ノ”(^・o・^)ノ”
(^._.^)ノ(^人^)(=;ェ;=)
(=`ω´=)(=`ェ´=)(=´∇`=)
(=^・^=)(=^・ェ・^=)(=^‥^=)
(=TェT=)(=xェx=)(=ΦエΦ=)
(ΦωΦ)(ΦзΦ)(Ф∀Ф)
(ФДФ)(ㅇㅅㅇ❀)(三ФÅФ三)
\(=^‥^)/’`<(*ΦωΦ*)>|ΦωΦ|
~(=^‥^)/~(=^‥^)ノ└(=^‥^=)┐
ヾ(*ΦωΦ)ノヾ(=゚・゚=)ノヽ(=^・ω・^=)丿
٩(ↀДↀ)۶d(=^・ω・^=)bo(^・x・^)o
V(=^・ω・^=)vㅇㅅㅇミ๏v๏彡
((≡^⚲͜^≡))(⁎˃ᆺ˂)(,,◕ ⋏ ◕,,)
(*✧×✧*)] ‘͇̂•̩̫’͇̂ ͒)ฅ ニャ❣(ٛ₌டுͩ ˑ̭ டுͩٛ₌)ฅ
‘`ローヽ(⊡ㅂ⊡。 Ξ 。⊡ㅂ⊡)ノ ‘`ロー₍˄·͈༝·͈˄₎◞ ̑̑ෆ⃛₍˄·͈༝·͈˄₎ฅ˒˒
₍˄ุ.͡˳̫.˄ุ₎ฅ˒˒✩⃛( ͒ ु•·̫• ू ͒)( ͒ ु- •̫̮ – ू ͒)
ฅ(⌯͒• ɪ •⌯͒)ฅ❣ฅ⃛(⌯͒꒪ั ˑ̫ ꒪ั ⌯͒) ニャッ❣(ะ☫ω☫ะ)
(ะ☫ω☫ะ)(ꀄꀾꀄ)(ะ`♔´ะ)
(ٛ⁎꒪̕ॢ ˙̫ ꒪ٛ̕ॢ⁎)( ͒ ˘̩̩̩̩̩̩ꇵ͒˘̩̩̩̩̩̩ ͒)ฅ ̂⋒ิ ˑ̫ ⋒ิ ̂ฅ
ฅ(≚ᄌ≚)(≚ᄌ≚)ƶƵ(≚ᄌ≚)ℒℴѵℯ❤
(✦థ ェ థ)(ↀДↀ)✧(ↀДↀ)
(ↀДↀ)⁼³₌₃(=ↀωↀ=)✧(●ↀωↀ●)✧
(๑ↀᆺↀ๑)✧(=ↀωↀ=)(●ↀωↀ●)
(๑ↀᆺↀ๑)☄ლ(=ↀωↀ=)ლლ(●ↀωↀ●)ლ
ฅ^•ﻌ•^ฅฅ( ͒ᵕ̳◡ᵕ̳ ͒)。o○˚₊✩‧₊(⌯͒o̶̶̷̤ ꀾ o̴̶̷̤⌯͒)* ✩‧₊˚
ฅ⁽͑ ˚̀ ˙̭ ˚́ ⁾̉ฅฅ ̳͒•ˑ̫• ̳͒ฅ♡ฅ(⌯͒• ɪ •⌯͒)ฅnya~ン❣
˓˓ก₍⸍⸌̣ʷ̣̫⸍̣⸌₎ค˒˒(⌯͒ᵕɪᵕ⌯͒)zzZ