1. Horus physically resembles isis not osiris.
2. He is not like osiris. No. Completely off the wavelength n mark here. Absolutely incomparable. That warning prophecy by thoth abt osiris son was abt anubis more not horus.
3. Maat goddess of justice wife of moon god thoth urged seth to talk abt past life. She was silent cuz if she spoke or revealed much it'll break taboo n trigger casualty aka anhilation /backlash on seths soul. She wants them to piece their past lifr clues by themselves
4. The probability of seth n osiris being past life lovers are lower than the probability of seth n Horus the elder as past lifr lovers. There's cryptic messages hidden by mojito in hieroglyphics that hint towards this.
5. What osiris has done so far is wrest divine authority from ra aka her throne, trick isis into marrying him to get egypt's rule n other incorrigible heinous crimes that ran River of life dry rendered fertile Egypt into vast sands n destabilize duat's balance apart from his other crimes. He did try to make seth remember his past n in process break taboo which caused seth to almost die [for this experiment he abused nephyths power of harmony to piece back seth together n keep him sedated n to prevent him from dying enlarged the sands. By size of sand u can assume how many times he repeated that. Made neph n seth marry too to keep seth leashed around him]
Osiris stopped the experiments suddenly n started devising other ways to get seth like babytrap him or using hathor's mirror. He even created anubis to use his body as a vessel for the child he wanted to make with seth n he constantly uses anubis to get seth
6. Acc to hieroglyphics hints by mojito abt their past lives an elder brother is mentioned who taught his younger brother n soon started finding him adorable. It could very well hint abt osiris who grew an one sided obession with seth n has a hand in the murder of their 5th aka youngest sibling horus. ( yes horus is the 5th sibling acc to actual myth n there are strong hints abt it being same in manhwa )
7. Nope he's not like father like son. Compared to all the shit osiris has been pulling/will pull/has pulled, horus simply crashed out momentarily in a fit of immature jealousy and fear of abandonment which is ofc not excusable but on his part deep down he knows even if seth loves him hes still not seths no1 priority and seth being the noble loyal man of honor would choose his family n duty even if he doesnt love them yk so he assumed seth was leaving him n acted out /lashed out. horus is anything but similar to rotten Osiris. Also he knows neph isnt in mirror anymore. She was freed in ch 186 n breaking it didnt do anything btw.
In case if u dont remember maat put a spell on seth during the trial where the slightest bit of offense/aggression against someone would instantly end his probation period n obliterate his soul or ship him to ra's boat. When seth dug horus eyes out, horus didnt budge, move or block. He purposly clung to seth so that the attack by seth would appear as welcomed by him or won't be counted as aggression. He basically saved seth' life even in the midst of his crashout but when do we see osiris do smth like this?
Horus also instantly regretted his actions btw. So pls dont hate either seth or horus. Like can pls acknowledge their shortcomings without mischaracterising them
Honestly, idk if it's just me but Horus did kinda look like Osiris, just minus the green skin, head piece and the chin piece. Feels like if they ever make a past story of Osiris with Seth when -before they became god and completely forgot everything, feels like Osiris would look like Horus. It is kinda implied when Seth asked if Osiris and him were together before and (forgot who it is) they didn't say anything just looked solemn at Seth and Seth was kinda crashing out with the silent implications. And then there's Osiris who desperately trying to do something in order to keep Seth with him..? Man, I completely forgot but he was trying to fight Ra becuz of it and willing to sacrifice everything, makes me think if he ever remembers his past, so if Horus do become/transform into a god completely, there might be a chance he can still remember Seth or at least his love for him... Man, I mean like father like son am I right..
But it's just a theory, idk if author is ever going to follow the og story or they gonna tweak it for this story （￣へ￣）