I’ll throw out as many particle ideas as I can think of on the spot based on the particles shown in that list. I dunno what the exhaustive list for usable particles is, if there’s one of those somewhere then that’d be appreciated.
Barrage
Maybe either of the flame trails (Flame Waker Boots or Death Goat, I don’t see the difference in the gifs shown) could be on or around the player’s head if the Barrage is cancelled prematurely by taking damage? After all, we don’t know how those rockets are appearing, but something’s clearly short - circuiting, so why not show that off?
Guardian
Keybrand effects on the player whenever they get an upgrade, since more upgrades mean more Guardians. That power’s got to be getting there somehow, it should be shown!
Shaman
This dabbles in some dark magic… albeit for a greater good, so it’s fine. Let’s lean into that a little more. The Shaman user has the Dark Harvest Hit effect surround their player when they take health. Other affected players have the Dark Harvest Buff pop out of them. To reflect the permanent health benefits from all that stored HP, when the HP boost is used all affected players (Shaman user or not) have the Stellar Tune particles surround them.
Time Warp
When the Time Warp user teleports back 3 seconds, i.e. the “Time Warp” command on the sidebar, the player leaves behind Rainbow Rod Hit particles. When they freeze enemies in time, i.e. the “Stop Time” command on the sidebar (or, well, tries to, the glitchy flying enemies would like to have a word with that), the other players have the Dark Harvest Buff particles pop out of their bodies when they’re slowed.
Telekinesis
When the Telekinesis user uses any of the Ability’s effects, Keybrand particles flash around their player. Stardust Guardian Punches could work too, but I suggest Keybrand since Telekinesis is more visual, so it could be seen more easily.
Wish
This Ability has a lot of effects, so it’s in a dropdown menu.
Suggestions for Wish particle effects. Large wall of text with unofficial labels and exact Wish text given
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Damage Boost (“I wish I dealt more damage”) - Displays Rainbow Rod Hit around the player when they gain the Damage Nebula buff.
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Player Death (“I wish to die”) - Displays Dark Harvest Hit around the player when they’re killed.
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Regen Boost (“I wish to heal faster”) - Displays Resonance Scepter around the player when they gain the Life Nebula buff.
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Instant Health (“I wish to be healed”) - Displays Stellar Tune around the player when they’re healed.
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Other Player Death (“I wish Player Name
would die”) - Displays Dark Harvest Buff around the targeted player after the “Danger approaches…” warning until the damage from the Wish is applied.
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Speed Boost (“I wish to move faster”) - Displays either of the flame trails at the player’s feet when they gain the Swiftness and Panic! buffs.
Reverent
This one is… I only played with the ability once so I can’t make too many suggestions, but knowing generally how the ability works I think having the Dark Harvest Buff starting to appear around the Reverent player’s body as they start becoming debuffed from increasing insanity would make sense. As the insanity debuffs flare up further it could change to Dark Harvest Hit. Overall, change between no particles (low insanity with no debuffs), Dark Harvest Buff (small particles if the player has some debuffs), and Dark Harvest Hit (larger particles if the player has many debuffs) based on the player’s insanity level.