A shape - shifting villain who can take on the form of anyone, including their friends and family. Adam and Tommy would constantly be on edge, not knowing who to trust. They would need to use their wits and the unique bond between them to figure out who the real villain is and stop it before it causes too much chaos.
I'm not sure specifically which 'Adam and Tommy Power Rangers lemon fanfiction' you're referring to. There could be many different stories out there. Generally, in fanfiction, it might explore different relationships or adventures between Adam and Tommy within the Power Rangers universe, but without more details it's hard to say more.
A plot could revolve around Adam and Tommy getting trapped in an alternate dimension where the rules of the Power Rangers are different. They have to figure out how to get back to their own world while also dealing with the strange new threats in this dimension. They might meet different versions of their friends and enemies there.
A new villain could be an ice - themed monster. Since it's Christmas, an ice - monster could be trying to freeze the city and cancel Christmas. He might be created by an old Power Rangers villain who is still lurking in the shadows but doesn't want to show their face directly.
We might expect some intense emotional moments between Adam and Tommy. Since it's a 'lemon' fanfiction, there could be some romantic or passionate scenes. But this is just speculation as different authors can take it in different directions.
A likely main villain could be a new character, a powerful alien - ninja hybrid. This villain would have the ability to use both ninjutsu and advanced alien technology. He wants to rule both the Naruto universe and the Power Rangers SPD universe. He would be a formidable foe as he can use Naruto - like stealth and the high - tech weaponry of the SPD villains, forcing Naruto and the Rangers to really combine their skills to stop him.
Lord Zedd would be a great villain. He's a classic and very powerful. His dark magic and evil schemes could pose a huge threat to both the Jungle Fury Rangers and any other rangers they cross over with. He could be trying to take over both their worlds or steal their ranger powers for his own dark purposes.
His fellow Power Rangers would definitely be his main allies. They've been through a lot together and would stand by him even with his vampire condition. Also, maybe an old mentor figure who has knowledge about vampires could be an ally, helping Tommy understand and control his new powers.
The Alien Rangers. They could cross over with the Megaforce Rangers. The Alien Rangers have unique powers and appearances. Their presence would add an extra layer of complexity to the story as they try to communicate and work together with the Megaforce team, perhaps to stop an intergalactic threat.
Orochimaru would be a great villain for them to face. He has a vast knowledge of jutsus and is always seeking power. Naruto would have to use his new Sage Mode skills, Sakura would need to use her strength and medical knowledge to counter Orochimaru's various poisons and regeneration abilities, and Hinata would have to rely on her Byakugan to predict his attacks. His sneaky and underhanded tactics would really test the team's unity and skills.
In 'Adam and Tommy MPreg Power Ranger Fanfiction', a recurring theme could be the protection of the unborn. Adam and Tommy would have to face various threats, not just from villains but also from the potential reactions of the outside world. This could lead to themes of secrecy, sacrifice, and the lengths they would go to protect their family - to - be. Additionally, themes of love and commitment between the two main characters are bound to be prominent, as they navigate this unexpected journey together.