If it was Irmo in the place Manwë with Fëanor’s child, how would that play out?
𝓐𝓝 ~ Interesting premise once again, thanks for the ask! I apologize for taking a while to answer sometimes, I always want to make sure I give these some proper thought so I can hopefully keep it fresh and bring new ideas to the table and you lovely people can get something out of it ♡
𝓕𝓮𝓪𝓽𝓾𝓻𝓲𝓷𝓰 ~ Once again gender-neutral pronouns for the darling and other details left unspecified, leaving it up to each reader's own imagination and preferences ♡
𝓣𝓦𝓼 ~ Yandere, obsessive behavior, manipulation, gaslighting, mentions of cheating
➺ Yandere!Irmo headcanons (general)
➺ Yandere!Manwë with Fëanorian!love interest
𐀔 Simply put, Irmo would be simultaneously more subtle compared to Manwë, but also more present in the life and affairs of the one he chose as his darling and wished to pursue.
𐀔 Much like his sister's student Olórin - who is also one of his servants - Irmo has the ability to inspire and influence people by putting thoughts into their minds, without them even noticing that these thoughts were planted by someone else. Being a Fëantur, he can perform such magic with utmost proficiency.
𐀔 Once the darling caught his eye - maybe during a feast, maybe when they visited Lórien to rest and relax - they became the new target of many of Irmo's spells and antics, including influencing their thoughts and mood, messing with their dreams and sending gifts he tampered with, such as sweets and treats that were "refined" with special potions of his making, sweet and flowery fragrances and handmade dreamcatchers.
𐀔 Irmo also liked sending his little moth friends to spy on his, as he thought, soon-to-be lover and quickly found out about their affair, if he hadn't already via their dreams. Under normal circumstances Irmo wouldn't mind - he's usually neither jealous nor begrudges his loved ones their fun and freedom, being fairly promiscuous himself - but this time he found that he was dismayed by the prospect of sharing his darling. This time, he told himself, he wanted to be the only one.
𐀔 The darling would need Fëanor's keen insight and to close their mind to see through Irmo's various manipulations and avoid being plagued by visions and thoughts of love and longing. However, they might still be relatively defenseless in their dreams, and Irmo would take full advantage, showing them entire scenarios involving the two of them that felt so good and so real too. What made it even harder to spot his interference is that he always appears to be such a cute, colorful and harmless spirit, despite being a Vala, and his sleepy and airheaded behavior - which is, as a certain Fëanorian soon found out, but a facade for a much more devious and cunning spirit.
𐀔 When the Noldor left Valinor, Irmo kept sending dreams and visions to his darling, but those got progressively darker, showing what would happen if they continue their journey. Whether the scenarios he showed were his own invention or based on his brother's prophecies remained to be seen, but either way, his favorite Fëanorian would need a strong will and unbreakable spirit to shake off those terrors and keep marching.
𐀔 Like Manwë, Irmo now also counts on the Doom of the Noldor, and once it catches up to his darling, he'll beg Námo to let him have their fëa. Whereas Námo is fair and neutral, he loves his brother very much and has never been good at denying him what he wants. Additionally, Nienna may also be swayed by her brother's heartache and speak in favor of him, making it even harder for the unfortunate Fëanorian to stay away from the Vala who is so relentlessly pursuing them.
𐀔 To Irmo, it ultimately doesn't matter whether his darling is alive or dead, even less so than to other Valar, because of his nature as a master of spirits. He can always trap them in an endless dream that only he can enter, so they can finally be together.
𝓐𝓝 ~ Sure do! I'll go over my general yandere Irmo ideas in this one.
Side note: A lot of these can also be applied to nightmare!Irmo as they're similar in their manipulative, predatory nature.
𝓕𝓮𝓪𝓽𝓾𝓻𝓲𝓷𝓰 ~ Gender-neutral pronouns are used in reference to whoever Irmo is pursuing, so it's up to the reader's imagination ♡
𝓣𝓦𝓼 ~ Yandere, obsessive behavior, manipulation
𐀔 Both Fëanturi are a more neutral force in the world. It's more evident with Námo than with Irmo, however: Just like there are dreams and nightmares, there are also darker sides to sweet, kind and joyful Irmo.
𐀔 Desire is in his name, and desire he does indeed, very passionately so in fact. He's used to getting what he wants, thanks to his boundless charisma, and won't be dissuaded easily once he decides there's something - or someone - he wants.
𐀔 To any prospective lover, Irmo would seem nothing but sweet and caring. He would invite them to Lórien to relax and unwind and use the opportunity to watch them carefully to find out about their deepest and most secret desires; and if they don't reveal them to him willingly, they might unwittingly do so in their dreams.
𐀔 Irmo visits the dreams of others often and with an air of careless innocence that makes his appearances almost seem like accidents, but this is very much an illusion. He knows his way around the unseen realm like few others and has perfect control over dreams, be it his own, the shaping of dreams that he plants in the minds of others or the manipulation of other people's dreams.
𐀔 And thus, any (un)fortunate person he wishes to claim as his lover would have their deepest desires and most hidden fantasies coaxed out of them through their dreams and twisted according to Irmo's design, so they may further his goals. He may show them romantic encounters, him pleasuring them like no one else can, sometimes even an entire life spent together to plant a seed of longing in their heart - a longing that he would be too happy to fulfill, should they ever ask.
𐀔 Conversely, Irmo may also manipulate their thoughts and feelings to make them hate or fear other people who stand in the way of him having his love all to himself - be it through carefully placed comments or visions and nightmares he designed for that purpose.
𐀔 Seeing through the facade of Irmo's sweet persona is nearly impossible and requires an extraordinary level of insight and resistance to the manipulation of others - or a mistake on his part. As emotionally intelligent and skillful in all things related to mind and spirit as Irmo is, he himself has strong emotions and can be impulsive. His control over himself has improved over the ages, but it's not always perfect.
𐀔 However, even if the person he's pursuing manages to see through his many deceptions, they would have a hard time finding help and support. To most other inhabitants of Valinor, the idea of sweet little Irmo doing bad things and hurting someone is simply inconceivable - and even if he has done something to them in the past, that memory has long been erased.
𐀔 And so, he most likely will end up with his darling in his arms anyway, binding their soul to his until the end of time.