There could be a non - magical creature, like a little earth pony who has a big heart. This earth pony could teach Twilight's daughter about the simple joys of life outside of magic, like enjoying a beautiful sunset or the taste of a delicious apple. They could form a very unlikely but heartwarming friendship.
She could be friends with the children of Twilight's own friends. For example, Pinkie Pie's daughter might be a fun - loving and energetic friend, always getting Twilight's daughter into some light - hearted adventures.
Flash Sentry could be a likely groom. He has shown an interest in Twilight in the past and they have had some interactions that could lead to a romantic relationship. Another option could be a completely new character, perhaps a powerful wizard or a prince from a far - off land who Twilight meets during one of her adventures and falls in love with.
A likely candidate could be Discord. He is known for causing chaos and mischief. He might pretend to befriend Twilight Sparkle only to betray her at a crucial moment. Another possibility is Trixie. Trixie has been jealous of Twilight in the past and could betray her out of envy.
It could be a pony who is extremely extroverted if Twilight is introverted. Someone who loves chaos and spontaneity instead of Twilight's love for order and planning.
Obviously, Twilight Sparkle herself. And her friends like Rainbow Dash, Pinkie Pie, Fluttershy, Rarity, and Applejack might also be involved. Maybe they follow Twilight back in time or she has to work with past versions of them.
There's also the possibility that it's an unknown stallion from a far - off land. Twilight could have had an adventure in a different region and met someone there. This would add an element of mystery to the fanfic, as the readers would be curious to learn more about the father's background and how he and Twilight met.
It could be a new character entirely. A mysterious pony who just arrives in Ponyville and catches Twilight's eye with his unique charm and different way of looking at magic.
First, you need to develop the character of Twilight Sparkle's daughter. Decide on her personality traits, whether she's more introverted like Twilight or has a more outgoing nature. Then, think about the setting. Is it the same Equestria as in the original series or has it changed? Next, come up with a plot. It could be about her trying to live up to her mother's reputation or going on a completely different adventure. For example, she could be exploring a new part of Equestria that Twilight has never been to.
One possible plot could be that Twilight Sparkle discovers her true heritage as Luna's daughter. This revelation could send her on a journey of self - discovery, trying to understand how she fits into the world with this new identity. She might face challenges from those who don't believe her or are threatened by her new status.
One idea could be that Twilight Sparkle's daughter discovers she has a unique magic ability that even Twilight doesn't fully understand. This could lead to her going on a journey to find out more about it, meeting new characters along the way.
She could marry Spike. They have a very special bond throughout the series. Spike has always been there for Twilight, and in fanfiction, this could develop into a romantic relationship leading to marriage. They already have a deep connection, and Spike's loyalty and Twilight's intelligence could make for a great couple.