What percent of the British army was Canadian in the war of 1812 against the U.S.?

Most of them. The bulk of the fighting was done by the Canadian Militia. Namely, the people who were then living in the place that would one day be called Canada. Most British regulars were off fighting in Europe.

Canada didn't exist during the War of 1812. The land mass was referred to as British North America.

The British had their own troops backed up by Canadians and their allies

The sacking of the city of York [ Toronto] in the war of 1812 British troops fled on sight of the Americans leaving the defense to the Canadians and their indian allies after a human scalp was found in the home of an indian the Americans sacked the city the burning of the white house and every book they could find in DC was retaliation for the attack on the capital city of York

At the start of the war there were about 5,200 British troops. By the end of the war there were about 48,000 British troops. There were 10,000 Provincial regulars and 4,000 militia raised in British North America (Canada). Regiments such as the Royal Newfoundland regiment date back to the provincial regulars.

canada didn't exist in 1812

canafa didn't become a country till like 1868

0.0%

By locals do you mean Native Americans because there were NO Canadian citizens ALL of them were British subjects........ as in NOT CANADIAN!!