i want a unique support thats fun and difficult

I have had this idea for a support that comes from the void and resemble's a symbiotic leech (for lack of better words) his whole concept is damage mitigation. now i know this can be a very bad idea of a champion with the community that changes champion ideas from one balanced champion to a champion thats fits another role very well. so to balance him i thought make his abilities do relatively no damage so he would be mostly a utility champion with early game ganking protection. im hoping he would also possibly fit the criteria for a jungler as well.

his scalings will be AD and AP mixed. id love to give more information on cooldowns and his ratios, but for now i would like to hear some feedback and tips/criticism is welcome! also i cant think of a name for him/her/it :/

Q: binds to an enemy and drains health ( similar to fiddle , but with the freedom of 's:W (low scalings, triple damage to minions and monsters) and you gain health, also grants vision while attached.

W: He would bind to an ally (like kalista R while its active ) (and only an ally or monster. self cast would be ridiculous so he cant do that) becoming untargetable and giving the recipient reduced damage at the cost of his own health and a CC shield, this ability cannot be canceled early and lasts 2 seconds.

E: after activation damage took will instead shed leeches and take reduced damage and gains tenacity, also gains a 15% speed boost. ( i imagine it like an exo skeleton being shed. Something like leblanc passive

R: shoots a tendril (can be cast 3 times, but is a skill shot) that deals 75/125/200 dam. (per tendril) and slows the enemy up 20% for each tendril, if all tendrils are cast on 3 separate targets they get rooted for 1 second. if all are on one the same enemy (the slow stacks) and applies grievous wounds for 3 seconds. like varus ult but an animation that looks thinner like a tentacle kinda

P: Upon death his body explodes a mess of leeches (roughly morgana's W range) which slows enemies and deals damage to enemies. damage dealt to champions this way grant him health based on damage dealt this way (15% of total damage dealt) (ex: 50 damage dealt would grant him an extra 7.5 health) (explode like zac passive )

This is my first time posting and i hope you like my idea! :D i hope i conveyed him as i had in mind