hmm, i do like these not gonna lie, but i had my own kinda HC for trolls. Not all of them being psychic however and with them based off of what we see the main 12 be capable of:
Rust bloods have telekinesis: seen in multiple parts of the comic and other media showing rusts off. very basic but considering aradia is capable of lifting a giant chunk of a mountain with her mind, im assuming there's no upper limit to how strong it can become and if there is we havent seen it yet. while other casts are seemingly capable of this to some extent, i think rusts specialize in mass u-haul mind powers with other casts capable of doing other things on top of this
Bronze bloods speak to animals and can fly: mostly from what i saw with vriska, and i could be wrong, she might've mind controlled tavros to float off the edge. this could be however just basic telekinesis, but i dont remember seeing virska ever use telekinesis but i could be wrong. The animal stuff could also be a good one, but i dont remember a single time something like that has happened. though hiveswap shown that not every troll with psychic powers practice them everyday so maybe this is one of those cases.
Gold bloods have electrokinesis: its been seem multiple times that this is the case and are the reason why im convinced that anyone with psychic powers on alternia has basic access to telekinesis. frankly i dont think i need to say more than sollux's ancestor was used as a battery to power a whole ship to prove why this is beyond likely. i could not tell you where the eye lasers fit into this though. maybe as a neat cyclops refrence but thats it.
Olive bloods have enhanced agility and strong immune systems: this is all coming straigh from just looking at how nepeta lives on a daily basis on alternia. she's clearly not as strong as the members of the other more physical leaning casts like indigo, purple, and fuchsia. but she didnt die till sgrub and claims to be an apex predator. while the skills she no doubt developted from living in the middle of a forest cave helped her survive as long as she did. there has to have been something else as well. plus high agility would just make sense on the cast that uses leo as their base sign. the hightened immune system is there because again, how nepeta lives, and it would make sense for the cast that might get converted into scouts/rangers for HIC's army would be able to survive most enviroment without worrying too much about foreign bacteria
Jade bloods have borderline radiation immunity and can grow plants: this is from jade living on a desert and my personal head cannon of alternia circling a neutron star (or some star that is far more irradiated than the one earth circles around) and quite frankly not much else. would be hard for most things to kill the mothergrub when they are living in a cave in the middle of a irradiated desert dont you think? the plant thing im stealing for similar reasons relating to the jade blood duties that are expected of raising the wigglers and keeping the mothergrub safe.
Teal bloods can telepathically talk to animals/have heightened senses: while i think it would possibly fit more with the bronze bloods solely because of them using taurus as their base sign. the communication with animals is also valid to belive be a thing with teals just due to how terezi interacts with her lusus. this could be a dragon thing, not a teal blood thing so i dont know. teals could also have hightened senses instead due to just how terezi interacts with the world after she goes blind. while having hightened sense when someone becomes blind is a normal thing to have happen, i dunno if you can just lick a monitor or sniff a book page with normal text and be able to read it as if you arent blind. though thats assuming the monitor of a husktop is really that similar to a normal PC monitor. like nepeta, i belive there has to be something that was already there that was hightened by her conditions
Cobalt bloods have mind control powers: vriska and aranea uses this like 50% of the time they show up in the comic. when they arent using box standard gaslighting, they can use their powers to initiate gaslighting + on their victims. these powers were naturally shoved to the wayside once their light powers came into fruition, but its kinda hard to think about cobalts without mind control powers IMO. While i doubt they would have spider powers. this doesnt mean that the concept of a pirate themed spider-vriska should be thrown directly into the trash!
Indigo bloods have super strength: i think it's physically impossible for a indigo to look like anything other than supermodel, or ultra buff gym rat. this would be a copy paste of what you put down so i wont bother. i wanna say that maybe indigos might have some sort of anger issue/rage thing common inside them, but it could also just be an equius problem.
Purple bloods are really good at a lot of stuff: They have the strength of indigos, the agility and immune system of olives, and psycic powers of rusts, just really strong all around. purple is a high ranking cast and it should be for a damn good reason. it would make sense if purple bloods are as good as if not better than the other casts that can do these things. i also want to say they have some radiation resistance, but they definitely wouldn't be able to just sun tan in the desert like a jade can without dieing slowly. not much to say other than they are just plain powerful and are highbloods for a reason
Violet Bloods talk with sea life?/are water benders?: Yeah ngl the fish talking stuff is given to violet bloods cause of eridan riding his lusus. dont really have much for the sea dwellers NGL. them being basic bitch compared to every other cast that has some weird thing about them would make them 100% more unique than anything else. course, basic bitch excluding the whale in the room that is their ability to live in the waters of alternia without drowning. i like to think that tolls as a whole have a resistance to bases and acids similar to humans having a resistance to cold and heat, with trolls having far weaker temperature tolerance than humans. Sea dwellers would naturally have a more enhanced version of this resistance but thats really all i can think of for concrete ideas for em. water bending does sound nice and the base sign for violets would back it up in terms of making sense though. wanna say the violets if they have to have something more than being sea dwellers should the more psychic leaning ones.
Fuchsia bloods have ultra strength?: got really nothing for fuchsia bloods. though i guess due to the seeming prefrence to deeper levels than eridan who seems to live a more amphibious life, fuchsia bloods might be super strong due to the natura water pressure at those depths. probably no more than indigo but 5 times better and can probably just tank a tank shell getting shot right at like they got punched in the ribs or something before using said tank to whack anyone nearby.
Mutant/Lime bloods have psionic resistance?/immunity? or something else?: i could not tell you where i heard this one, but i remember this headcannon of limes including the mutantblood are resistant or maybe even immune to any and all forms of psionics and that being why they were hunted into extinction due to being resistant to the background mind control HIC was doing to everyone. i think the concept is good and would make them definitly stand out. though giving them pyrokinesis would be a rather ironic and funny thing to give them due to the mutant's history with heat. could also be some sort of foresight/precognition ability as we saw the signless gain visons of beforus, something that shouldnt be possible. i dunno, at this rate im just throwing random stuff out.
do love your ideas for them. the water bending and cryokinesis stuff could lead to some funny stuff of terezi and nepeta pranking eridan by just getting him stuck in a block of ice for a while!
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