Maybe Galvatron.

IDK about the other two.

Starscream and megatron transformers prime

Megatron.

Morag (The Loud House) or Chelsea Van Der Zee

Balthazar Bratt and Queen Barb.

Haven't seen Loud House but Chelsea is a mediocre villain.

Queen Barb definitely. She is a great parallel for toxic fandoms. Bratt's style of comedy was funny at first but it quickly became annoying for me. He is also pretty under-utilized.

Vector Perkins and Lord Business.

Maybe Lord Business. I found him more charismatic.

Ramses II and Tai Lung

Humpty Alexander Dumpty and Queen Barb

Beerus and Frieza