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

Super Robo Fighter 3
70

Chase Racing Cars
71

Bridge Constructor
60

Stickman Shooter
63

Night Slaughter
70

Lego DC Mighty Micros
73

Highway Rider Extreme
72

Ben 10 Hero time
73

Car Speed Booster
68

Ben 10 Racing Boy
100

Police vs Thief: Hot Pursuit game
71

Knights Diamionds
69

Save The Cowboy
74

Sand Worm
75

Slenderman must die Chapter 7
75

Drunk-fu Wasted Masters
71

Block Pixel Cops
65

Russian Car Driver
73

X-Trial Racing MA
84

Red Driver 2
77

Zombie Choppa
74

Bazooka and Monster
68

Bomb It 2
73

Boat rush
70

Fireboy and Watergirl 3: In The Forest Temple
69

Gunblood
74

Frozen Boy Super Run
100