Big Bro Ashido Groovin
Milo Ashido's (big bro) quirk is "Corossive Pores," which is very similar to Mina's. The only difference is that he basically sweats acid. Due to this, his acid has had a "bleaching effect" on his skin and hair (which is why he has blond roots and eyebrows) and allows his skin to melt into a more fluid/slippery texture on command. His "slippery form" is basically an acidic formless blob that can easily be manipulated into any shape or form as long he chooses (within reason to his body mass).
He can only activate his acid quirk while in this slippery form, which he has chosen to be in the shape of a cute little slimeball. He's quite fast when in this form and can take the shape of almost anything but has to stay hydrated to maintain his quirk. Staying too long in his slippery form can cause severe dehydration and may require medical assistance.
While in this form, whatever he touches or wraps around for more than a few seconds, begins to corrode away. Mina is the only one who can hold him while he is in his slime form because of her similarity in quirk structure 👍