"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
