As pointed out by others, the first three minifigures are genuine LEGO (with the second having perhaps a few custom accessories). The fourth is not a LEGO minifig. It may include some genuine LEGO elements (legs, hands, etc), but the militaristic accessories are not LEGO elements. This appears to be a custom minifig sold at one time by Modern Brick Warfare.
The figure holding the lightsaber is composed of the head and hair of Anakin Skywalker from the Clone Wars series:
the torso of Luke Skywalker as a Jedi Knight:
and a pair of dark gray legs on medium gray hips:
The clone figure has the torso of a shock trooper from Ep 3.:
But I couldn't find the helmet.
Zovits identified most items, the missing helmet is a Stormtrooper Type 2 helmet from an AT-AT driver, which is likely also where the legs from the Anakin/Luke mix figure as identified by Zovits come from.
As an added bonus: the torso of this AT-AT driver is used on the middle stormtrooper on the second row from the front, so you have the complete figure.
These are identified from left to right.
Series 18 of Lego Minifigures has that first policeman. Here is the exact minifigure.
The second one appears to be from Series 9 of Lego Minifigures. Here is the exact minifigure.
The third policeman appears to be LEGO Policeman with Riot Helmet Minifigure with a different head. The head might be Minifigure, Head ...
The torso for this figure is 973pb0321c02 Torso Town Vest with Pockets and Striped Tie over White Open Collar Shirt Pattern / White Arms / Yellow Hands.
It comes in several minifigures, but none of them are like yours, so I think this is composed of other parts ( a MOC figure) and not directly from a set.
At this point in time we probably won't get an exact match for each piece, but this is what we've got so far:
A01. Part #87991 - Minifigure, Hair Tousled with Side Part.
A02. Minifigure Head: Unknown ???
A03. Part #982pb062 - Arm, Right with Blue Short Sleeve
Part #981pb062 - Arm, Left with Blue Short Sleeve Pattern.
A04. Minifigure Torso: ...
I could find a few pieces with flames on BrickLink:
Minifigure, Headgear Head Cover, Flame Head Piece
Minifigure, Head Modified Alien with Trans Orange Flaming Hair and Reddish Brown Face, Yellow Eyes and Headband Pattern
Minifigure, Head Modified Alien with Trans Orange Flaming Hair and Skull with Yellow Eyes Pattern
Minifigure, Head Modified Alien with ...
This minifigure is a mixture of several other minifigures.
Torso Western Bandit Card Suit Vest and Gold Fob Pattern / Green Arms / Black Hands
has been used for just one minifigure called Bandit 3. Legs are matching yours so these two most likely come from the same minifigure, which appeared in 5 sets.
However your example is missing top hat and is using ...
Part # 16691pb01
Minifigure, Hair Long with Nougat Headband Pattern
Part # 3626cpb0931
Minifigure, Head Dual Sided Black Eyebrows, Cheek Lines, Chin Dimple, Determined / Bared Teeth with Red Eyes Pattern (Superman) - Hollow Stud
Part # 30153
Rock 1 x 1 Jewel 24 Facet
After scouring all of the Batman minifigures catalogized by Brickset, I couldn't find any exact matches for any of the two torsos, but it is just as possible that these particular figures are not indexed by Brickset or have some kind of other name.
The wings of the right one seem peculiar to me, I suspect they are non-genuine.
Higher resolution photos ...
Here are the parts you're looking for:
wheel base 2x4 and so on
also arm part
head with freckles
Based on the collected links, this might be one of the sets you own. It is too challenging for me to identify any others, sorry for the inconvenience: https://www.bricklink.com/v2/catalog/catalogitem....
The red cap is fairly unusual. The head with the freckles as well...
Based on that I would say the Universal Building set 50-1 on BrickLink
The rightmost wheels are in that set too. The other wheels are so common that there are dozens of sets with them.
I found another listing for the same minifigure on Etsy with extended description, which doesn't mention LEGO parts have been used. Otherwise that would be a selling benefit. Also, two sentences below, extracted from description, make you assume minifigure is built from non-LEGO parts.
This custom Minifigure works with any building block set.