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.