Q1-Answer: The lore isn't there for now, i created this character literally as i was making him, but well the idea of a dual wielder or triple swordmens was there, but if this character does get popular i will make a backstory and try and draw an illustration.
Q2-Answer: For the mana-drain i thought that all characters had mana and will now change that and make him possibly recover his mana (What you said) on champions who don't use mana.
Q3-Answer: I was thinking of it only using his passive against champions this is because if you chain all of his abilities i thought it would be too op so if it isn't give me some ideas and i will incorporate it into the character.
Q4-Answer: I plan to give the character all these details i must first balance it all out and not make the character too op, but i like the idea of him sticking to his target, i made this ability for him to close the gap between him, his enemy and to escape away from battles and for collecting cs aswell.
Q5-Answer: How does this work with his lore, why is he cutting himself with his regular swords? - So i plan to make a lore for him as i said before but on the other hand i will give you a glimpse of what i have thought about for his two other swords. Ok so i plan on making those two other sword like legendary swords, these swords have been passed down from generation to generation and both have been wielded by legendary swordmens. My other idea is to make them into holy swords the opposite of the demon sword so you can tell me which one is better or i can take more ideas.
Q6-Answer: Yes i was thinking of making the ultimate single target, and it will strike the enenmy from anywhere in a circle around him. No they are not empowered and yes im thinking of making the lockout 1.5 seconds, and the reason why the last hit poisons the enemy is because he hits the enemy with his demonic sword.
Q7-Answer: This character is mostly about his abilities and this is because you can easily chain his abilities and that is how i wanted it to be like, the reason why i said tanky-assassin is because i would like him to have a lot of health like Shen does when you buy items, and his E on the other hand is something he loses and gains and this is the result of him using his demonic sword.
Suggestions-Answers: Q: Is an empowered auto, maybe add some additional effect aside from damage, while passive is in effect it burns a much larger portion of mana. (i would like to add this)
E: something like a brief shield or damage reduction on use to help with not dying (the result of him using the demonic sword is to lose then gain something but this will just make it a win-win situation for him)
R: Is a targeted ability that applies on hits, gap closes a short distance, and has something like a 1.5 second lockout between uses. Poison on third hit is gone since the timing is supposed to be more tactical. (I will make it an targeted ability or is it already?, i will add that it closes the gap or should i not because he already has his W? you answer this for me, and the poison is the result of him using the demonic sword)
Thank you MooooooooreDakka for commenting on my post and i would love for you to leave more suggestions and ideas.