Meta Knight
The Copy Ability introduced in "Kirby's Adventure" would go on to become a staple mechanic in Kirby's move repertoire. The game was also the first "Kirby" game to introduce unlockables for finding certain items hidden throughout the levels, which again became a recurring theme in later games. Meta Knight became a recurring playable character in the "Super Smash Bros." series, starting with "Super Smash Bros. Brawl" in 2008.