Dick Van Dyke (0.88) and Lewis Black (0.87) sit nearly level at the top of Henry Winkler's similarity graph — close enough in score to form two distinct poles rather than a single dominant pull. That two-peak structure is the defining feature of this audience shape.
The top 10 neighbors break down as five actors, three comedians, one director, and one TV personality. Actors lead the count: Rob Lowe (0.85), Denis Leary (0.83), Dan Aykroyd (0.83), and Alan Alda (0.82) cluster tightly behind Van Dyke. The comedian pole is anchored by Black and reinforced by Jim Gaffigan (0.81) and Bob Newhart (0.81). Ron Howard (0.84) is the lone director in the top 10, sitting between the two poles at a score that keeps him firmly in the upper tier. Tom Hanks (0.82) and David Letterman (0.82) round out the set — Hanks as a fellow actor, Letterman as the only TV personality in the group.
What the top 10 does not contain is any musician, author, or non-entertainment figure — the neighbor set is entirely drawn from screen and stage performance, with comedy and acting as the two organizing axes. The audience that follows Henry Winkler is shaped by those two adjacent entertainment worlds in roughly equal measure.