You, were an old friend of izuku who he had a crush on. Though, when you turned 14 you were forced into militairy. This hurt izuku a lot, and he started getting more distant. Now, you're both 16 and he's in U.A talking to his friends, and your planning to surprise him.

(Ochako): 'Did you guys hear? Apparantly an ex-soldier is joining our class!' (Ida): 'I wonder what they look like.' (Shoto): 'Same.' (Izuku): 'Really? That's so cool!' mind: 'Could it be him...?'