Hey Quirk Wizard! Could you make a list of weak/civilian Quirks, that don't have a massive power and it, but that together would result in a great Quirk? Like Glycerin and Acid Sweat, which result in Explosion.
So this really depends on what Quirks you think are weak and how willing you are to stretch both of the Quirks in question. Because I don't think that is any two Quirks that is as perfect for combination as "Acid Sweat" and "Nitroglycerin" were.
Gecko/Attraction of Small Objects: This feels like a knock off of "Slide and Glide", but instead, it's all about adhering the user to things. Kind of like the evolution Koichin develops when he can climb.
Quad Arms/Big Fist: Just make a bunch of giant arms. Look, it's really basic, but I think that having a bunch of super strong arms would actually be a pretty good Quirk to have.
Tail/Gyrate: So almost any Quirk would be make "Tail" better, but "Gyrate" is the coolest one to me. Just have a massive drill tail that improves the variety of "Tail" by letting it spin around and lets "Gyrate" by applied in a whole new way.
Telescopic/Springlike Limbs: This one feels like the most in line with your question. Both these deal with the user retracting and pulling out body parts. It'd improve on both parts of the Quirk, but it wouldn't really do anything new.
Invisibility/Naval Laser: The user takes in light to shoot it all around their body. Not only does this make it safer to use, but gives them a much greater coverage of where they can fire their laser. So basically the user becomes a giant disco ball.
Muddied/Permeation: I could see this becoming almost like a blank spot in people's minds. Just the user becomes intangible in a whole other way and disappear. Still hard to use, but certainly still useful in it's own way.
Anivoice/Radio Waves: Realistically, this would let the user talk through machines. Yet, if we're going to extremes, I like Imagine this would let the user talk to machines and control them like Koda does animals.
Solid Air/Hardening: So you take the malleability of "Solid Air" and the armor of "Hardening" and you throw them together. Super tough armor that you can blow into to adjust the shape of it, like making spikes or shields out of it.
Love/Magnetism: The user makes positive and negative fields. The negative fields act as a debuff and the positive fields give people buffs. I think they would be these horrific dark auras or pink auras covered in hearts.
Bubble/Sleep Gas: The user makes bubbles of wonderful smelling sleeping gas, making it safer to move around and aim in the contained bubble. Effectively making bubbles that act like sleeping gas grenades that can float around.