Italy might be a likely candidate. He is friendly and kind - hearted. His naivete could make Anastasia feel at ease, and his love for food could be something they bond over. For example, he could introduce her to Italian cuisine, which she might find fascinating.
One horror story could be about overly possessive fans. There were cases where some fans would attack others who didn't share the same 'ship' (relationship pairing) in the Hetalia fandom. They would send mean messages and create a very hostile environment for those with different opinions.
I also like 'Female Italy's Journey'. It follows her on a journey across different regions. Along the way, she meets various characters and has heartwarming and exciting encounters. The writing style is very vivid, making it easy to picture the scenes in your mind.
One interesting 'Hetalia Bedtime Story' could be about the adventures of the characters in different historical settings. For example, their interactions during a major world event like the Renaissance. Another could be a story of how they celebrate their national holidays together in a fictional world. And there might be a story where they have to work together to solve a mystery that involves all their countries' cultures and traditions.
One interesting 'new hetalia stories' could be about the cultural exchanges between different nations in a modern setting. For example, how they share their traditional cuisines and learn from each other's cooking styles.
Often, these fanfics might use the Hetalia characters to either exacerbate or relieve the reader's suicidal feelings. Some Hetalia characters, like Italy, might be used to show kindness and friendship that could potentially be a ray of hope for the suicidal reader. However, others like Prussia might initially seem dismissive due to their brash personalities, adding more to the reader's internal turmoil.
I'm not entirely sure specifically as 'hetalia threeway lemon fanfiction' can vary greatly. Generally, Hetalia fanfictions often involve characters from the Hetalia series in different scenarios. But 'lemon' usually implies some form of romantic or sexual content which may not be appropriate or acceptable in all contexts.