An archrival is a particularly fierce or passionate rival.
joker
Nemesis
Blueto or Brutis
Main competitor
Best friend
Pisa
Bluto. In earlier cartoons it was Brutus
Other words with similar meaning include nemesis, scourge, archenemy, or archfoe.
It would be either the Pittsburgh Steelers or perhaps the 49ers, Rams, or Cardinals (NFC West)
Yes, arch can be an adjective, meaning either principal or mischievous. Examples : an arch foe, an arch glance (It may be a prefix, or hyphenated form, in words such as archbishop, archrival or arch-villain)
Bluto is always finding ways to make Olive like him.In some early cartoons he was called Brutus
Don Paolo is the bad guy, He is the archrival to Professor Layton, in the past they both loved Claire, but Claire chose Professor Layton and Don Paolo is angry.