Speckled Sussex
This is a large breed that has wide shoulders and a curvy but rectangular shaped body.
Their body is long and deep and their tail is held at 45 degrees to the body.
You will notice they have a single 5 pointed comb – in addition they have
wattles and ear lobes. All three should be a lovely deep red color.
Their eyes are a shade between red and orange and their pointed beak is a horn color.
Finally their skin should be slightly pink and their shanks should be white.
https://www.chickensandmore.com/speckled-sussex/

The breast is straight, the body is wide and these birds overall have a wonderfully symmetrical and pleasing build.
The feathers are heavy and soft, but typically maintain a tight, neat appearance which further enhances the crisp aesthetic of the various colors and patterns.
https://thehomesteadinghippy.com/speckled-sussex/

The Sussex have a single red comb and red earlobes. These chickens have rectangular bodies, long shoulders, and a long, broad neck. With good care, they can live for eight years.
Bantam Sussex, weighing two to four pounds, are available but difficult to locate.
https://backyardpoultry.iamcountryside.com/chickens-101/sussex-chicken/

Speckled Sussex chickens have broad, flat backs and chests along white feet, legs, and skin. Their tails sit at 45-degree angles and their legs remain bare instead of growing feathers.
An interesting feature of the Speckled Sussex chicken is that, as it molts, its speckles multiply.
https://www.knowyourchickens.com/speckled-sussex-chicken/

The Speckled Sussex can be vividly described as heavy, soft feathered with the feathers being closely fitted.
https://chickenjournal.com/speckled-sussex/

As Speckled Sussex chickens get older, their adult markings will show up in full force. Their adult plumage is a deep mahogany with some feathers dipped in white and others in black. After each molt, the white tips will multiply, leading the chicken to have more speckles as it ages.
The wattles, earlobes, and combs of these chickens are all a deep red. It has a horn-colored beak, a flat, broad back, and a broad, deep chest.
https://www.heritageacresmarket.com/speckled-sussex/

At first glance, one cannot help but think that the Speckled Sussex chicken is a perfectly proportionate breed. They are characterized by a broad and long back that is followed by a tail that rests at a 45° angle. Their shanks and toes are white in color and their legs clean (meaning their legs will remain bare, rather than grow feathers).
Speckled Sussex chickens have a single comb with five well-defined pointy ends, medium-sized earlobes, and small- to medium-sized rounded wattles. These are all red in color. Keep in mind that single combs are more susceptible to frostbite so you have to make sure your Speckled Sussex chicken flock is safe and warm enough during the winter months.
https://www.ecopeanut.com/speckled-sussex/

A good quality Speckled Sussex should have a flat, board back with a deep chest. The base color of their plumage is red mahogany.
At the tips of some of the feathers are white spots with black/beetle green iridescent bars separating the spots from the mahogany. Every year
when the chicken molts they will grow more feathers with white spots.
The skin of a Speckled Sussex should be white, and their feet and legs should be as well. They have a single red comb. A single comb is the most common one seen on a chicken. It is one line with several spikes along its length. Their ears and wattles are also red.
Any chicken with crooked or extra toes, a crooked beak, or other malformations doesn’t meet breed standards. Some of these malformations can impact the quality of life of the chicken by hindering its ability to eat or move around effectively.
https://cs-tf.com/speckled-sussex/

Prize-winning Speckled Sussex:
One site I read from described Sussex in general as "brick shaped".
I think that's helping me.
The grayish-white legs and scrawny appearance of "Blue" just bumped him down to the rehome list.
Addendum: these are characteristics for standard Speckled Sussex, can't find anything for bantams.