When it comes to Jojo's stands, being from parts 3-8, there's almost a general consensus of who the top 6 stands are. In no order; Wonder of U, Gold Experience Requiem, Tusk Act 4, Made in Heaven, D4C (Love Train), and Soft & Wet (Beyond).
Khnum is arguably the weakest Stand in all of JoJo's Bizarre Adventure. Its ability is Transfiguration, allowing its user to take the appearance of another person. The problem is that Khnum gives its wielder no additional abilities. Furthermore, its user Oingo is often played for comedy rather than any serious drama.