Stitch can lift 3000 times his weight, and is bulletproof and fireproof.
He has an incredible sense of sight and hearing, and can switch between heat, x-ray, and night vision.
He can climb up walls, jump really high, and curl into a ball and roll about.
All that, and he's pretty damn durable.
He can survive falls of several thousand feet and can also survive getting hit by a big ass 18-wheeler. He "only" went unconscious.
And he's all around pretty damn destructive.
So for Angel, just have all of the above on top of her ability to charm the other experiments and turn them evil by singing.
But only the experiments that come before her number (624).
Any experiment after her, like Stitch (626), are immune to her singing.
Meaning if any other experiments are around her she can have them all attack you.
Oh and she can use her antennae to reach far off objects and as a ranged attack.
I sure hope Johnny isn't the last cartoon you watched.