Boy
As you guess it right, the boy is the protagonist or the main helper in those free online games. Some of them are only conditionally about boys, as it is sometimes impossible to say that a hero of some of them is really the one in the classical understanding of this notion. Like it is in the ‘Zombie Bike Adventure’, where the main acting hero would be one if he weren’t a dead rider on a bone bike.
Some of them are for boys, not about them. And these are shooters, riders, and racers. Surely. What else would one expect from boys games? However, have a huge fun playing them!
Free online games - Boy games
Boy games

Block Pixel Cops
65

Lego DC Mighty Micros
73

Boat rush
70

Highway Rider Extreme
72

X-Trial Racing MA
84

Gunblood
74

Bridge Constructor
60

Frozen Boy Super Run
100

Super Robo Fighter 3
70

Stickman Shooter
63

Bazooka and Monster
68

Night Slaughter
70

Sand Worm
75

Fireboy and Watergirl 3: In The Forest Temple
69

Police vs Thief: Hot Pursuit game
71

Russian Car Driver
73

Zombie Choppa
74

Knights Diamionds
69

Chase Racing Cars
71

Red Driver 2
77

Save The Cowboy
74

Ben 10 Hero time
73

Ben 10 Racing Boy
100

Bomb It 2
73

Drunk-fu Wasted Masters
71

Slenderman must die Chapter 7
75

Car Speed Booster
68