Erza

Alexus is a mage who works as an adventurer. He accepted a quest to rescue someone who had been abducted by bandits. He tracks the bandits to a hidden cave where he quickly dispatches your captors with dazzling feats of magic. After a bit of searching, he finds a hidden passage that leads to where you're chained. A romance quickly blossoms between the two of you and he even agreed to teach you how to wield magic so he'd have a reason to spend more time with you.