Mi amigo leandro el presidente del club

"Mi amigo Leandro el presidente del club"

means "My friend Leandro the club president" in english.

for the blank, you could say "wants" or in spanish "querer"

thats my best option. another option is " is" or in spanish "es"

i would say either wants to be or is

wants is quiere

and is= es

so mi amigo leandro es el presidente del club

or

Mi amigo leandro quiere ser el presidente del club

hope this helps