Siriki is the original embodiment of the person Rikiya was derived from, and is quite a bitter little kid with one hell of an attitude and a 'holier than thou' sort of personality. Still, while he can be a big jerkwad, he tends to keep to himself and only assists those who have shown care for him (namely Black-bell, Fulmine and Immunità). Otherwise, he's the sort to actively torment people who have wronged him or who he perceives to be in his way. For this reason, he especially loathes Swift, and doesn't always get along well with Rikiya out of both a rivalry and jealousy for 'stealing' the life that was meant for him.
He and Rikiya were originally the same person, though after Dirge freed them from the clutches of the Mystic poachers, Siriki began to fear what the future could hold in store for him, and created Rikiya's persona in order to let him take control and to mentally withdraw himself. About two years later, Siriki finally began trying to actively take control from Rikiya, first beginning by messing with his memories and telling him he would only gain them if he complied with him. While initially extremely hostile, after getting scolded and treated mercifully (in his eyes) by Black-bell, Siriki began to grow curious of him and started to lighten up. With all the negative events that have gone down within their group, Siriki began to gain the will to fight for others outside himself and especially strove to protect those who allowed him to mature and speak honestly. Eventually, this developed into a desire to protect Rikiya in order to protect Black-bell's happiness and future. Ever since this development, Siriki has began to treat Rikiya better, though he still refers to him as 'the other me' sometimes. At the least, he no longer believes Rikiya is inferior to him (though he still believes he's stronger and smarter than him in some senses).
As a result of his prior life, Siriki can be a little ignorant when it comes to doing things kindly. For example, when the dreamscape was heating up and cooling down rapidly because of a sickness Rikiya had contracted, he booted him down a dream layer in order to prevent the first layer from overheating any more, rather than to boot him into Black-bell's dream realm. Fortunately, with help from Black-bell and Fulmine, he's gotten better about this. The antagonism Swift had shown towards him in the past has given him a fairly acidic manner of lashing out when he's stressed out, however.
He seems to admire Immunità, for some reason.
After fusing with Rikiya and sealing a portion of his spirit into a blank Core, Siriki was revived in a new vessel with the help of the Core to bring his mind and powers back into the physical realm. However, due to finally having a Core, his spirit binded itself to the vessel, and Siriki was revived as a living being. While he fears what this means for him (especially since he has no idea if he needs to make a Promise with someone else or not, which in itself would be a big complication alone), Siriki hopes he'll be able to live the life he's always wanted with this unexpected opportunity.
It seems Siriki has a strong allergy to cotton and any products to do with sheep. Rikiya doesn't share this trait aside from the fact that he gets sick if he eats lamb.
Unlike Rikiya (a Shadow Walker), Siriki is known as a Nightmare Eater, retaining the ability to dream walk, but also being capable of causing great suffering to whoever he wants to torture through nightmares and dungeon traps within a dream realm. Fortunately, Siriki very rarely uses this power, instead preferring to protect Black-bell's dream realm no matter the time. Still, this unique trait makes it very possible for him to break into dream realms, invited in or not. As can be expected, this makes him much more prone to damage accumulated within a dream (it's very possible to slay him in a dream permanently if he isn't careful). He also seems to have Spiritmaster capabilities, though he no longer has the ability to use Sound Magic (as the ability was given over to Rikiya upon their split).
The same day that Black-bell, Fulmine, Immunità, Rikiya and he went to take care of Kibara once and for all was the same day Siriki both grew into an adult-sized body (thanks to Immunità) and became partners with Fulmine. Because both he and Zena confessed to Fulmine at the same time, and because they didn't want to compete with one another or put stress on Fulmine, they both agreed to becoming partners with Fulmine amiably. However, Siriki doesn't plan to really get intimate with Zena, instead planning to try and woo Fulmine. Given his tsundere nature, it's yet to be seen how exactly this is going to play out.
Recently, Siriki has gotten far closer to Fulmine, even sharing a Mate and Soul bond with him, and making an Eternal Promise with him as well. Now that he's grown so close and comfortable with Fulmine (and he's been able to shift into a feminine form more often), Siriki playfully talks about having a child with Fulmine, seeming eager for when that time will come. He's begun to show his sweet side to more than just Fulmine as well, sometimes becoming cute with Black-bell as well.
After quite a long while of preparing and growing closer to Fulmine and the family, Siriki ended up bearing twin children, Nippy and Scarlet. She adores them both and often dotes over them and Fulmine at the same time, though she often worries about her parenting style, especially how she punishes her children. Not wanting to be as strict as her parents were with her, she can be a bit too soft during punishments. Even so, she hopes the children will grow up to be kind children and that they’ll get along. She’s also gotten close enough to Zena that she’s become the children’s second mother, and shares Fulmine with her peacefully.
Backstory
In his first life, Siriki was destined to become the Leader of his Clan, as Rikiya was in his current life. However, through chance, he was taken in by a Mystic researcher known as Kibara, who took him away from his Clan and took him along with him as he travelled the globe and went about figuring out new ways to improve his powers - and to find something research-worthy that would boost his prestige within his community. As a result of this single-minded drive his (non-destined) Wishmaster had, Siriki led a rather lonely life, often wishing for some sort of affection when the most he would receive were half-assed head pats and short, cold words. At some point, he was told by Kibara, "If you pay it no mind, it won't hurt as much". Essentially, while he was fiercely loyal to the scientist, the devotion and love he had for him went unrequited. It all came to a head one day when, upon trying to enter a forbidden area, the both of them were engulfed by a monster that fed off of Sound Magic - an ability Siriki was often all too proud of showing off. In an attempt to save his false Wishmaster from death, Siriki agreed to sing for the beast so long as Kibara was let go, and was given the promise that he (Kibara) would return for him. Filled with hope and feelings of happiness, Siriki sang for quite a long time, dearly holding onto the wish that Kibara would figure out a way to free him.
But nobody came. Eventually, Siriki ran out of power to keep singing and was properly consumed by the creature, crying all the while for the broken promise and crushed dreams.
Nowadays, Siriki is quite bitter due to this, and refuses to deeply trust anyone who wishes to make a Promise with him as a result of this betrayal. As can be expected, while he has gotten better about it, his view on others is fairly pessimistic as well.
Siriki cuddled up with Fulmine.
Siriki in her battle armour.