As for my comic, The Chronicles of Oro... I have a few ideas.
I've noticed in a lot of anime that the first opening is high-energy and exciting to get new viewers interested. And ending songs are calm and almost melancholy. So I've tried to stick to that theme.
For an opening:
As an opening, it's kinda cheesy... but there are a few lines that hit really close to the plot. Perhaps, like some of my favourite anime openings, it could be one where you notice that there are spoilers hidden in the opening that you hadn't noticed at first?
And for an ending:
This song I would consider more an ending for a movie, but it could be repurposed for an end-credits. Especially if the song remained the same and the imagery changed once every so many episodes and slowly started to make more sense to the plot the closer to the end it is.
Heehee this was fun!