Many call me The Man with the Axe
But I'm not a violent man
I am the ruler (though some challenge the facts)
of a minor, yet important, clan.

I am not a sailor at sea on a ship,
yet a deck is where I can be found.
People say I am a girl's best friend,
but not when my Queen is around!

I am usually seen on a Bicyle's front,
but I can neither peddle nor steer.
I become even stronger if I am named Trump.
Have I made my identity clear?

Answer:
I am the King of Diamonds in a standard deck of playing cards.

In case of any questions ...
The King of Diamonds holds a large axe over his shoulder.
Some may argue that an Ace is the top rank of a suit.
In bridge, clubs and diamonds are minor suits.
There is a cliche, Diamonds are a Girl's Best Friend.
Bicycle is a popular brand of playing card.
In bridge, the trump suit beats any card from other suits.