Trixy- Jinx's crazier sister
"You think I'm crazy?... You should see my sister." 
Trixy is an assassin/ fighter type. She dual-wields butterfly knives, and can be extremely dangerous in 1v1 fights. Any lore/ art concepts are welcome. Damage ratios, and stat ratios are welcome- but I think her Attack Damage should be moderate due to her passive. I know Jinx is a fan-favorite, so I focused on Jinx's crazy personality, and magnified it for Trixy's abilities. Hope you all like her. :)
Passive- Always Personal -Trixy deals additional damage to targets she's taken damage from in the past 1.5 seconds. Additional damage scales of Trixy's Attack Damage.
-Dealing the final blow to monsters or enemy champions grants Trixy +1 permanent Attack Damage.
Q- Psychotic passive- Killing a unit grants Trixy additional attack speed, which stacks up to 5 times (psychosis stacks) and decays when Trixy isn't in battle. active- Trixy gains all 5 stacks of psychosis, and her attacks deal bonus damage in a small AOE, which scales off her Attack Damage. levelling this skill- Increases the duration of Psychotic's active.
W- Crazed active- For a few seconds, Trixy gains increased Attack Range and her basic attacks cause her to jump to her target, and slow them. levelling this skill- Increases Attack Range from ability.
E- Crazy Eyes passive- While Crazy Eyes is ready for use, enemy champions in Trixy's vision become marked with an eye. Trixy maintains vision of marked enemies for a short time after they leave her area of vision. active- Trixy silences marked enemies with a frightening glare for a short time. The eye marking the enemies becomes large and staring. levelling this skill- Increases duration of Visibility from passive, and increases duration of Silence from active. I imagine a crazy b!7@4 giving you a look- and you just stfu on the spot haha
Ultimate- Sadomasochism passive- Upon taking lethal damage from an enemy champion or monster, Trixy goes into stasis for a short time and adds 10 seconds to the abilities active cooldown. Once Trixy comes out of stasis, she instantly teleports to the target that slew her with a flurry of her blades that deal true damage based on the damage that killed her. active- For a short time, Trixy's basic attacks gain life steal, and attacks against her redirect damage to attackers. Redirected damage scales off attacker's base Attack Damage. costs- 100 Rage levelling this skill- Increases % life steal, and % damage redirected. (The passive and active have separate cooldowns, the cooldown for the passive will be displayed with jungle buffs)