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For me, "да" as a conjunction sounds like a looser variant, "and [well] [maybe] also". A very slight additional meaning of something free/natural/careless, when used for a whole sentence.
"и" is a...

Да, -юга просто экспрессивный суффикс, и отрицательность зависит от контекста и замысла говорящего. Например, если сказать "зверюги!", то оно значит "bastards!", а если охотник скажет "зверюга", то...

It was part of the original dialect spoken in Moscow, before dialect levelling took place (mass migration to Moscow from other regions). Also -кой/-кый instead of -кий.

Пятеро can be used only with masculine nouns.

Пятеро мужчин = correct
Пятеро женщин = incorrect

Пятеро acts more like a collective noun rather than a simple numeral. Something like:

пять...