Japanese people have invented tons of emoticons, but the ones you have listed were popularized among the users of 2ch more than 20 years ago. They are collectively called 2ch系顔文字. They were super-popular in the past but they may look rather outdated today.
(´｡• ω •｡`)
These are variations of ショボーン, which was named after the onomatopoeia しょぼん. It basically expresses a disappointed face (or sometimes an innocent gaze).
ω is a mouth,
` are eyebrows,
｡ is a cheek.
(´•̥ ω •̥` )
A variation of ショボーン with teardrops. 😢
This one is a variation of キター, named after 来た ("Here it comes"). It refers to an excited, energetic face.
° refers to a widely-open eye,
∀ is an open mouth, and the slash
/ refers to the person's raised arm. So this one is like "Hey", "Yes", "Look at me", "Got it", "Come on", etc.
This is a variation of ゴルァ named after コラ. This
д refers to the mouth of an angry person, similar to this.