Some skill ideas, I really do think this is a good idea, I'll also post this in the poll thread. DONT IGNORE ME CUZ I'M GRAY! THERE BE BUGS!
Passive : ?? Can't think of a name . . . Maybe Brood mother?
-After killing X minions (20-30?) she gets a spiderling pet that has high movement speed, low attack damage and life, and carries her Arach Venom (E) No death timer, so it would be possible to have 2-3 of these things active at one time, but no more.
Q - Impale: A slightly longer-ranged melee hit using one of her front legs that lowers the defense and magic resist of the target
-AD-Based damage, either a shorter Jarvan Q or a single-target, small radius skill, low-mid cooldown (I'm thinking start it at around 10 secs, have it go down to 5)
W - Web Snare: Spider Queen shoots a web in a cone in front of her, dealing no damage but slowing enemies hit and drawing them into melee range. Skill points could increase the speed that the prey is drawn in, or increase the slow duration.
E - Arach Venom: Similar to Teemo's poison, but with a slowing aspect also. Think Ashe's frost shot mixed with Teemo's poison, but at a melee range. Toggle-able, uses mana per-hit.
R - Nest: Spider Queen saves up enough webbing to create a nest on the battlefield. The nest is stealthed, and when an enemy unit steps on it, it becomes visible, slows any units that walk on it, and emits (5/7/9) spiderlings which are the same as her passive spiderlings, but with a death timer. Once the web is visible, has a death timer of 10 seconds. Spider Queen can save up to 2 nests, and takes (45/40/35) seconds to stack a nest.
I see the Spider Queen as a melee support champ with assassin capabilities (if built right). The Q and W both serve to help teamfights, the nest could be used as a ward, as a way to kill minion waves, and as a 2nd big slow in teamfights, with some DPS, more or less depending on your build. The E is there to make offensive Spider Queen viable, but since she's melee, you'll have to rely on the W to get champs into melee range. If you still want to keep the stealth aspect that they had for her previously, you could have Nest stealth Spider Queen when she stands on it.
PS, I like the art, but IDK if she should be a humanoid champ with spider characteristics, or a Spider champ with a human top half. Whatever ur flavor Riot, but we want her.