The detail on page one that most strongly suggests Beowulf's power is Beowulf's size compared to others.
Beowulf's power is that he possesses superhuman strength. He shares the appearance of the first monster that he killed. This hero is strong and courageous and is described as having the strength of 20 men in just one of his arms.
Page one gives details as to the enormous size of Beowulf compared to others, which allows readers to infer that a key point of his powers may be a great strength.
Everytime she glancec at him she got butterflies in her stomache. She couldn't help but to stare, though. His blonde hair and brown eyes were incredibly dreamy. Everytime she thought about him she just started to blush.