Japanese ususally doesn't use plurals, but with two exceptions; 等 and 達

等:ら: more rough, rude. Half the time hiragana. Only used with these three things: あいつ等:あいつら:those clowns 彼等:かれら: him and his homeys 奴等:やつら: those assholes over there

  達 :たち: Used with most "people" pronouns, but not with animals.??? Usually used only in these 4 situations: 仲間達:なかまたち: the group of friends. 人達:ひとたち: people. 子供達:こどもたち: the children.

私たち;わたしたち: us