What did Fan Xian do in his previous life?

One manhwa that could be similar is 'The Max Level Hero Has Returned'. It has elements of powerful heroes and epic battles like in Return of the Unrivaled Spear Knight.

They have some really exciting team-ups. Spiderman's agility and Ironman's tech combine for epic battles and problem-solving.

I'm not sure. This kind of content may be inappropriate or violate certain norms.

I'm not sure there's a direct connection. Fluttershy is a character and the titter tree might just be an unrelated element.

One option could be to look on educational resource websites. They might have printable Captain Underpants comic strips for educational or entertainment purposes. Another possibility is to check the official website of the Captain Underpants series, though it's not guaranteed they'll have printable versions available.

I'm not sure exactly as I haven't read it myself. But you might be able to find detailed information on dedicated comic forums or websites.

I'm not really sure. Maybe they have no direct connection at all.

No, such content is highly inappropriate and violates moral and ethical standards.

British superheroes in Comic Vine frequently showcase a sense of duty and loyalty. Their adventures often involve protecting not just the world but specific British interests and communities. Plus, their character development is often deep and complex.

Well, sometimes music is used in Iron Man comic adaptations or promotional materials to enhance the mood and excitement.