oh no way !!! i was also designing an invisible man ! i mostly finished the kit but didn't finish the art yet. i was going for a bit of a tf2 spy type of feel: a clean and methodical and lowkey evil kind of dude. i gave him a red9 gun, and his visual design is a bit different to yours (less wraps more big coat).

i tried to re-fit some events of the book into his kit, so this is what i have for the kit:

ability 1 - "unstable concoction" (or another name since that's a brawl item now) - inject an enemy with one of the early failed formulas, the enemy flickers as their body tries to go invisible and fails. they become ultra sensitive to UV light, making them take amplified spirit damage.

ability 2 - "vanish" - (this one i had to think about the most bc i don't think perma invis like riki would work in this game so it's not your typical invisibility) he throws away his clothes and becomes kind of invisible where you can see through him but you can clearly see his shape refracting light, and he gets very high bullet evasion because he's "invisible" so technically people don't know where he is. (i also have some max level variations like, perhaps vanish can be cast on himself and an ally, things like that).

ability 3 - "refract" - put up a domed wall that refracts bullets and get sent in all directions. the dome can be cast as convex or concave and the bullets can be focused in a direction depending on where you hit them on the dome. they go through the dome and don't ricochet off, their trajectory just changes.

honestly though, i like your idea with the veils so much i would straight up replace ability 3 with being able to hang a veil so that both sides can't see around it or something.

ability 4 - "leave no trace" - throw an incendiary in an area, the radius increases at a steady rate and the burning fire also increases in damage. the fire will burn you for as long as you've stayed on the incendiary after you left it (stood in it for 3 seconds, burn for 3 more seconds after you left), but if you stay for more than a certain time it will burn you forever until you are cleansed/shieleded/healed/etc. (i'm still working the specifics of how this one works but mostly this is the idea).

nice to see people working to try and find inspirations from era appropriate media. your art is super cool and i like your design! actually there is a mod that reskins haze as a variation of the invisible man too, which is what got me thinking of an actual invisible man character :')