There are 108 names for Lord Hanuman in the Sanskrit Language!
Not many know that Lord Hanuman has five brothers. Kesari, father of Lord Hanuman had six sons with Hanuman being the eldest. The other five sons' names were Matiman, Shrutiman, Ketuman, Gatiman, and Dhritiman
Lord Hanuman was an Incarnation of Lord Shiva
Wishing Lord Rama's long life, once Hanuman applied Sindhoor all over his body
Lord Hanuman and Bhima were technically brothers as their spiritual father is Vaayu (King of winds)
Hanuman was once cursed by a sage that he forgets all his powers
To save from the demon Ahiravan, Lord Rama, and Lakshmana, Hanuman transformed himself into Panchamukhi Hanuman - consisting of Narasimha, Garuda, Varaha, and Hayagriva.
Lord Hanuman is a bachelor but he has a son named Makardhwaja (not biologically)
Hanuman once had to fight Lord Rama, his divine figure
There is a deep belief that Lord Hanuman created his version of Ramayana called Hanumad Ramayana