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

Red Driver 2
77

Drunk-fu Wasted Masters
71

Stickman Shooter
63

Lego DC Mighty Micros
73

Russian Car Driver
73

Save The Cowboy
74

Car Speed Booster
68

Frozen Boy Super Run
100

Chase Racing Cars
71

Zombie Choppa
74

Police vs Thief: Hot Pursuit game
71

Bomb It 2
73

Highway Rider Extreme
72

Knights Diamionds
69

Sand Worm
75

Fireboy and Watergirl 3: In The Forest Temple
69

Ben 10 Hero time
73

Boat rush
70

Bazooka and Monster
68

Bridge Constructor
60

Super Robo Fighter 3
70

Gunblood
74

Ben 10 Racing Boy
100

Night Slaughter
70

Slenderman must die Chapter 7
75

Block Pixel Cops
65

X-Trial Racing MA
84