Rod Strickland (above) and Kevin Porter
I couldn't decide on one, so I picked two.
Neither played that long with the Wiz (Strickland for four years and Porter for six) but both did a great job when they were there.
Strickland, who was acquired in '96, helped the Bullets reach the finals for the first time in nine years while averaging 18 points and nine assists. The next season, he led the league in assists with 10.
After that, everything went downhill and he left the team in 2001.
Porter, on the other hand, was drafted by the team in the third round (back then they had third rounds) and started for the Bullets team that got swept by the Warriors in the finals. He led the league in assists that year, a feat which he would accomplish three times in his career before retiring in '83.