In alphabetical order

The following artists and groups have "unclear" Wu-Tang connections. They may or may not be Wu affiliates.

12th Disciple
Other Names: n/a
Notes: MC. Close former affiliate to the Sunz Of Man.
Albums: n/a

Black Justice
Other Names: n/a
Notes: Darkim associate who has appeared on a number of tracks with Darkim himself.
Albums: n/a

Booster
Other Names: n/a
Notes: Reggae artist popularly known for his appearance on "Bring The Pain". Booster also featured on Method Man's sophomore album on the track "Cradle Rock".
Albums: n/a

Carlton Fisk
Other Names: n/a
Notes: First and only appearance on a Wu album was Method Man's "Tical". Carlton was featured on two tracks "PLO Style" and "Mr. Sandman".
Fisk has also appeared on a radio freestyle alongside Street Life, Method Man and Inspectah Deck.
Albums: n/a

Darik the Assassin
Other Names: n/a
Notes: Darkim associate who has appeared on a number of tracks with Darkim himself.
Albums: n/a

Ellie
Other Names: n/a
Notes: Female vocalist and MC of sorts. Also a close associate of the Othorized F.A.M. Ellie is featured on a large number of tracks on "1st Amendment".
Albums: n/a

The Force MD's
Other Names: n/a
Notes: This already established group have seen many roster changes over their long spanning career. Currently their members are Jesse, Khalil, Stevie D, and Trisco.
As part of his Razor Sharp contract, RZA was asked to resurrect the standing of this Staten Island vocal group. They first made their Wu album appearance on "Ironman", and later on RZA's "Bobby Digital" project.
Albums: [Various "pre-Wu" albums]

Kbar Allah
Other Names: n/a
Notes: Darkim associate who has appeared on a number of tracks with Darkim himself.
Albums: n/a

K-Tez
Other Names: n/a
Notes: Shyheim affiliate who was featured on a number of tracks on "AKA The Rugged Child".
Albums: n/a

Life
Other Names: n/a
Notes: Male vocalist who sang on GZA's "Cold World" track. He is the older brother of Wu producer John The Baptist. Has reportedly recorded around 100 unreleased tracks.
Albums: n/a

Madam Scheez
Other Names: Mad Cez
Notes: Female MC who first came to light on "Digital Bullet". She is closely linked with the Deadly Venoms.
Albums: n/a

Mad Murdoc
Other Names: n/a
Notes: Brooklyn Zu associate, once believed to be a part of the group itself. He is credited as being an MC on Ol' Dirty Bastard's "Protect Ya Neck II The Zoo".
Albums: n/a

Ms. Roxy
Other Names: Roxanne
Notes: Female vocalist first heard on "Wu-Tang Forever". Has also appeared on RZA's "Bobby Digital" project.
Albums: n/a

Ndira
Other Names: n/a
Notes: Female vocalist who is featured on the Bobby Digital projects.
Albums: n/a

Neonek
Other Names: n/a
Notes: MC, but primarily a Producer who's works include tracks by Cappadonna.
Albums: n/a

Njeri
Other Names: n/a
Notes: Female MC who contributed a verse to GZA's track "1112".
Albums: n/a

Shadii
Other Names: n/a
Notes: Male vocalist who sang the hook on Inspectah Deck's "Uncontrolled Substance". Some believe Shadii is a member of The Force MD's.
Albums: n/a

Shotti Screwface
Other Names: n/a
Notes: MC and close associate of LA The Darkman.
Albums: n/a

Uncle Pete
Other Names: n/a
Notes: Neither an MC nor a producer. Uncle Pete's role within the Wu-Fam seems to be only that of a preacher or mentor. He can be heard on the track "Wu-Revolution" on "Wu-Tang Forever", and "Yolanda" from Master Fool's "Brownsville Kid".
Albums: n/a