Well, let’s try and figure out which ones he could possibly have vs. hopefully not have obtained:
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Fear: Has the power to bring fear to the hearts of even the Toa Nuva. - Considered immoral by Toa
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Disintegration: Has the power to reduce even Protodermis to dust. - Too OP, and probably considered immoral by Toa
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Poison: Dangerously toxic even to a Toa Nuva. - Probably considered immoral by Toa
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Fragmentation: Has the power to create explosions in the immediate area. - Probably considered immoral by Toa
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Hunger: Has enough strength to drain the energy of a Toa Nuva. - Considered immoral by Toa
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Anger: Has the power to turn even the Toa Nuva against one another in total rage. - Considered immoral by Toa
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Weather Control: Can manifest powerful, dangerous thunderstorms and blizzards at will. - Too OP
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Elasticity: Can stretch incredible lengths in the blink of an eye to infect a faraway mask. - Too OP/weird
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Heat Vision: Powerful long-range heat vision can ignite any object within sight. - This one stays, as it is not only obviously canon, but also goes really well with his fire powers
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Illusion: Can create and control multiple realistic illusions anywhere within sight. - Already obtained this power from Noble Kanohi in ’01
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Teleportation: Has the power to teleport itself through any wall or other structure except the shields of Karda Nui. - Too OP
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Quick Healing: Almost indestructible; if captured, can be used to heal the injuries of others. - You know, the Star Wars Sequel Trilogy has convinced me that this is actually the best idea ever Sorry folks, but even though it’s too OP, Greg himself has stated that this is one of the powers Tahu has (Maybe there’s still some way it can be nerfed or worked-around)
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Laser Vision: Fires powerful eye-beams that can burn through solid Protodermis. - Jury’s still out on this one. Tahu already has heat-vision, and one might consider it too OP to make him able to just up and burn through solid Protodermis
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Gravity: Uses gravity control to crush any object in visual range. - Too OP
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Electricity: Powerful electrical field can be controlled to surround or stun distant objects or creatures. - This one might be too OP due to its range, and the fact that we don’t want him able to cancel-out the opportunities for cool fight scenes by simply instantly and non-violently detaining everyone. Maybe the power of Chain Lightning, or more-likely, Sonics, (both of which are discussed below) is a better fit for Tahu, instead
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Sonics: Blasts distant objects with powerful waves of sonic force. - Might be a good fit: recognizable as a power he wouldn’t normally have, but possibly similar enough to the way his existing powers work (firing elemental blasts that can damage stuff). Might also make for interesting moments where he could use the power to shatter crystalline or glass-like materials (And no, this clearly not motivated by missing the days of Krakua’s Kanohi being considered to be Hau-shaped). Maybe the modifier “distant” gives this power too OP of a range, though (although it’s still probably not as OP as Electricity or Chain Lightning)
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Vacuum: Has the power to create gale-force winds or instantly reverse their flow. - Too similar to Lewa’s Air powers, and I don’t want Lewa to be obsolete
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Plasma: Has the power to instantly melt any object into vapor. - If this was merely akin to giving him elemental Plasma powers, I might’ve been okay with it, but if it’s at such a powerful level that it lets him just melt anything instantly, then it’s too OP
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Magnetism: Possesses magnetic powers strong enough to tear a slab of Protodermis in two. - Too OP (We’ve already got Zaria, we don’t need an additional Magneto, let-alone one who can also control Fire and numerous other powers)
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Fire Resistance: Strong enough to withstand the heat of Tahu Nuva’s magma swords. - I say we keep this one, since it makes sense as an upgraded extension of Tahu’s powers
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Ice Resistance: Impervious even to the cold of Kopaka Nuva’s ice blade. - Jury’s kinda still out on this, but my personal opinion says no. I don’t wanna make Tahu immune to his biggest physical weakness, and I don’t want him to automatically win any possible future arguments he could get into with Kopaka or Gali (Yeah, I know they’ve all matured since ’03, but there’s still a chance that at least some more drama of the potentially comedic sort could arise to at least some degree, given the right circumstances)
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Mind Reading: Powerful enough to invade the mind of a Turaga or Toa Nuva. - Seems too OP, and we don’t want to make Orde obsolete right after he’s been introduced.
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Shapeshifting: Has total control over its own shape, although its mass cannot change. - This one MIGHT be okay to keep (there’s a big qualifier there). It depends on whether this ability is seen as him having access to a Great Mahiki instead of a Noble one, or him being a too OP Skrull
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Darkness: Has the power to consume all light in a large area; only Takanuva’s light is stronger. - Probably considered immoral by Toa
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Plant Control: Has total control over any plants in the area. - Let’s not give him Jungle powers, please.
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Molecular Disruption: Has the power to utterly disintegrate any inorganic object with a touch. - Likely considered immoral by Toa
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Chain Lightning: Controls devastating bolts of chain lightning that leap between multiple targets. - Might be a good fit: recognizable as a power he wouldn’t normally have, but possibly similar enough to the way his existing powers work (firing elemental blasts that can fry stuff), as well as the fact that I believe that (unless I’m mistaken) in a series called Avatar, if someone with fire powers unlocks his true potential, he gets lightning powers, as well. That being said, it might be too OP, especially if it makes him able to electrocute every enemy in his vicinity, making every battle for him be less difficult than the Battle of Wakanda to a Stormbreaker-wielding Chris Hemsworth
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Cyclone: Has the power to create and control powerful cyclones at will. - Too similar to Lewa’s Air powers, and I don’t want Lewa to be obsolete
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Density Control: Complete control over own density and that of any object in physical contact. - This one MIGHT be able to be kept, if it’s used in a way that doesn’t make him too OP, but used in a way that’s much more like how he would’ve used his Kanohi Hau Nuva and Kanohi Miru Nuva
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Chameleon: Has the ability to become completely invisible in any environment. This one MIGHT be okay to keep (there’s a big qualifier there). This might be seen as him having access to an upgraded version of a Great Huna instead of a regular version of a Noble one, but it probably makes him too OP
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Accuracy: Can strike the smallest target at a great distance or in any environment or condition. - Too OP
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Rahi Control: Has absolute control over every living Rahi in the near area. - Too OP
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Insect Control: Powerful enough to control and command an entire hive of Nui-Rama. (what’s even the point, insect Rahi are still Rahi, why bother with the distinction?) - Too OP
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Stasis Field: Has the power to freeze a creature in near-permanent stasis through eye contact. - Too OP
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Limited Invulnerability: Absolutely invulnerable to physical harm of any kind. (yeah, very limited) - Renders Kanohi Hau basically obsolete
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Power Scream: Power scream shatters stone and can be heard all across an island. - Too OP
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Dodge: Impossible to physically strike, no matter how swiftly or powerfully. - Too OP and Renders Kanohi Hau basically obsolete
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Silence: Aura of silence is powerful enough to temporarily deafen a Toa Nuva. - The jury’s still out on this one. Might be considered immoral by Toa because of it being the power of a Makuta’s Kanohi, might not be considered immoral by Toa since Toa of Sonics can do it without the Kanohi. Either way, it probably makes Tahu too OP
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Adaptation: Instantly adapts to take maximum advantage of any condition or situation. - Depends. It could be seen as an upgrade that nicely compliments his Kanohi and armor, him having a Mask of Adaption, or as too OP, which it may well be.
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Slow: Able to rob even a Toa Nuva of all speed as long as it remains nearby. -Most-likely too OP
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Confusion: Extended proximity can reduce even a Toa Nuva to mindless babbling. - Considered immoral by Toa
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Sleep: Has the power to instantly put an entire village into deep sleep. - Too OP and Makuta-esque