In 1986, Ware signed with the World Wrestling Federation, where he was known as the fun loving “Birdman" Koko B. Ware. Koko made his debut as a fan favorite on the September 6, 1986 episode of Superstars, teaming with Paul Roma against Hart Foundation (Bret Hart and Jim Neidhart) in a losing effort. His first victory was on September 7 episode of Wrestling Challenge against Bob Bradley.
He would make his entrances dancing to the ring to the tune of Morris Day and The Time's "The Bird", flapping his arms and carrying his pet macaw “Frankie", who sat on a perch at ringside while Koko wrestled. Bright outfits, colorful sunglasses, a constant smile and his trademark vibrato voice instantly made Koko a big hit, especially with the younger crowd that the WWF mainly catered to during the 1980s. Koko also sang the title track of the 1987 WWF album "Piledriver" (which became his entrance music).
Koko’s first major showcase in the WWF was at the November 29, 1986 edition of Saturday Night's Main Event where he defeated Nikolai Volkoff. Koko, however, would often be on the losing end when he came up against other established stars, stars as Butch Reed, Greg Valentine, and The Big Boss Man. From 1987 to 1993 Koko appeared on several WWF PPVs and Saturday Night's Main Events being used mainly to make established or rising stars look good. At the Survivor Series in 1990, Koko became the first wrestler to fall victim to The Undertaker’s Tombstone Piledriver in the Undertaker’s debut match.
In 1992, Koko teamed up with Owen Hart to form the high flying team known as High Energy, well known in wrestling for their gigantic baggy brightly colored pants and checkered suspenders. High Energy feuded with (and generally lost to) The Nasty Boys, The Headshrinkers, and Money Inc.. The team made only one PPV appearance as a team, a loss to the Headshrinkers at the 1992 Survivor Series. The team ended in 1993 after Hart injured his knee. After High Energy ended, Koko was mainly used as an enhancement talent, losing to such stars as Yokozuna, Doink the Clown, Skinner, Jeff Jarrett and former tag team partner Owen Hart before leaving the WWF in mid-1994.
In 1999, Koko made a short-lived return to the World Wrestling Federation where he put on the “Blue Blazer" mask during the Owen Hart angle. When Hart died, the angle was dropped and Koko’s services were no longer needed.
He also appeared at "WWE Homecoming", Raw's return to the USA Network, on October 3, 2005. He fought (and was defeated by) Rob Conway on the October 28, 2005 edition of WWE Heat.
On April 4, 2009, Koko was inducted into the WWE Hall of Fame by The Honky Tonk Man.