Is the Reincarnated Slime Too Weak? I Can Be Ever-Changing

In everyone's eyes, I'm just a harmless slime. Mentor Kyle: "It's just a pet, it will only lower your level." Me: ['Exploding Fireball' detected, 'Lava Bug' progress +10%… Not bad, here's another one. Father Elric: "Alas, the family's bloodline has become thin after all..." Me: ['Blood Dilution Theory' detected, 'Human' form progress +0.3%! Good guy, please tell me about five more yuan! Vivian: "Rosie, why are you always staring at the book? Do you want to use it as a pillow?" Me: (Speechless) Sister, I'm trying to figure out how to get you to sign a contract with me and take me off! They thought I was being cute, but actually I was stealing. They thought I was in a daze, but actually I was analyzing magic. When Vivian was cornered by the demonized wild boar, everyone thought she was dead. I silently jumped out of her arms, my body flushed red. Everyone: "What can a slime do? It's going to be crushed!" The next second, a [Slime Bomb] comparable to a "exploding fireball" exploded in front of her. Everyone: "..." No, why can this slime cast fireball? !