More like guessing but theory sounds smarter.
Four guys:
1. Archduke (this one is obvious and he endgame)
2. I say Chris the archduke's friend
3. Sadly red head from the beginning (dude was really into Chole BLEH!)
4. Blonde dude who is manipulating her ex-husband (just choose him at random)
Definitely guessing and I expect to be wrong about all but #1. Anyone else want to throw their hat in the ring? ε=ε=(ノ≧∇≦)ノ ε=ε=(ノ≧∇≦)ノ
PS: I thought about Evan (Silver head dude) but he is married but then again...
I agree with Archduke and Chris. However the other 2 are by far a reach but you had 1 partly correct I guess well mostly the hair color. I think the other 2 will be
1. Thomas the red head she saved from dying of poison boar meat.
2. Trigger while stating his preference he never said that he was EXCLUSIVELY gay. I believe he's bisexual.
THE UNCLE ANASTACIUS IS POSSESED!!! (╯°Д °)╯╧╧
Now hear me out, first the red eyes are super sus and is the same as Duke Alpheus in this scene (Ch 85) after Anastacius controls him
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_chapter-85/pg-3/
Now something to keep in mind for later
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_chapter-85/pg-7/
"Thanks to you, it seems that it'll become much easier to move about"
BUT WAIT THERE IS MORE!
Next lets look at this chapter (88)
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_v-3-chapter-88/pg-11/
He mentions that Lucas might notice "Me" which is what makes me almost 100% sure that he is possessed
Next Chapter 84 big hints to possession
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_chapter-84/pg-8/
Something is talking to Anastacius telling him that it will lend him his power and then the next panel present Anastacius says "The assimilation wasn't complete, I was to weak" Σ(っ°Д °;)っ
Next chapter 83 keep this panel in mind
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_chapter-83/pg-5/
Then this shit happened in ch 73
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/mpn_chapter-2348680/pg-1/
Now who is possessing him????
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/d_chapter-83/pg-4/
IT IS AETERNITAS!!!!!!!!!
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/mpn_chapter-2348680/pg-1/
Boy can't let go of a gruge.
I think before the possession Anastacius did care for Claude which makes this so sad
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/mpn_chapter-2308369/pg-5/
http://www.mangago.zone/read-manga/suddenly_became_a_princess_one_day/uu/mpn_chapter-2308369/pg-6/
TL;DR It is very likely that Anastacius is being possessed but a previous king Aeternitas. Why don't know but suck because it looks like Anastacius was actually a decent person and has been fighting off Aternitas all this time with some success. (Didn't hurt Janette when he could, didn't hurt Atty's mother and it took forever till Anastacius attacked Claude)
I think Claud's older brother (dude who just reviled himself to everyone) is possessed because he never wanted to hurt Claud as a child and was even kind to him. Plus at the mention it looked like he was being possessed. Now by who you may ask. I think it one on the late kings, to be specific the one that Lucas insulted. So I don't wish his death just yet. IF my theory is correct then he is just another victim.
I NEED TO COMMENT OR I'M GONNA EXPLODE (This is probably going to be long........... ╮( ̄▽ ̄)╭)
No reading this comment until you have read chapter 61 or your choice...
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-6/
Shuli crying just made me so sad
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-7/
Shuli bent down while Nora hangs of the ledge is so picturesque, especially Shuli's emerald eyes in the frame right after. Again I must complement the artist who work on this from the main artiest to any one who helps them.
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-8/
Last panel had me squealing, my fangirl heart. ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-10/
ε=ε=(ノ≧∇≦)ノ NORA'S BLUSHING!!!
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-14/
I can't be the only one saying yummy to Nora's adult physique ლ(´ڡ`ლ), tall dark and handsome, man did you grow well
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-16/
1. this scene took my breath away
2. again yummy Nora
3. Shuli look stunning, gorgeous, I simp for her, like seriously wtf artist just knocking that drawing out of the park!!!
4. THEY LOOK SO GOOD TOGETHER, THANK GOD IT IS VERY LIKELY THAT THEY ARE ENDGAME AND ANYONE WHO IS AGAINST THAT CAN FIGHT ME (but not really because I would probably lose but I would go down swinging at least )
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-17/
Oh no hear it comes
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-18/
1. ouch
2. OUCH
3. why is this scene so beautiful but hauntingly sad.
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-21/
Still feel bad despite I was told that he was an ass in the novel??? Don't know but still feel bad because don't think a dude should die just because he failed to protect some one but then is ye olden times.
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-22/
Dude go fuck yourself "I didn't know he would get in this much trouble" Hope you get royally fuck in this timeline, double point if the cardinal betrays you while doing it and Albert does the killing blow or something like that. If this fucker get a redemption I'm be pissed, won't drop or riot just be pissed because he is still a little weasel in the current timeline. No I take that back weasels are adorable, he is still a slimy little roach. much better.
http://www.mangago.zone/read-manga/a_stepmother_s_m_rchen/hs/d_chapter-61/pg-23/
1. hate that the last panel gave me chills
2. hope the worst possible fate is instore for you. It better not be quick.
All the points if Shuli is the one who end him (probably not going to happen, bet is Nora is gonna do it but hey I haven't read the novel so it could happen)
3. Again a giant fuck you to you, you bastard. I literally can't think of an insult right now which is pissing me off but still fuck that dude. (╬ ̄皿 ̄)凸
Okay that is the end, thanks for coming to my ted talk, if you got to the end thanks ヾ(❀╹◡╹)ノ~