Ursula

Ursula is the Sea Witch of Atlantica, currently its ruler, and is a major fighter in all 3 wars against opposing factions.

Non-Disney Villains War
In the NonDisney War, Ursula first gained control over the seas, but was killed by Messina, desiring the trident for herself. Ursula ended up getting resurrected by Morgana, and then proceeded to try and control Frollo's faction through hypnotism as Vanessa. She ended up getting revealed by Ratcliffe and Morgana, and then fled with her sister back to the sea in a rage. The sisters finally regained control over the trident, but it was Ursula who backstabbed her sister for her earlier betrayal. AND...she was finally able to defeat Messina and regain control over all the ocean.

However, with the coming of the second war, Ursula found herself confronting new threats to the throne, in particular Joe the Fish and MerMan. She did away with them by having the Evil Manta and Marina Del Ray take care of them.

Disney Villains War
In the Disney Villains War, she once again took control over all the ocean, but was briefly engaged in a scuffle with Captain Hook, who she managed to defeat for the time being. Realizing her jeopardy, she tried to defeat Governor Ratcliffe as quickly as possibly, but was slain by the ship's bow. Morgana ended up gaining the trident for herself.

Marvel and Disney Villains War
vs Atuma and allience

Ursula battled Attuma over control of the seas and won, but ended up getting by Jafar into Maleficent's Villain Vale alliance in the Forbidden Mountains.

vs Venom 2

When the Symbiote rebounded with a new host Maleficent ordered Ursula to deal with him. Ursula used her powers and defeated the 2nd venom.

Vs Baron Struker and quiting the team

With Maleficent and Pete missing, Ursula, Hades, and Hook were attacked by Baron Struker and Grim Reaper. Ursula tried to use her magic from her cauldron but prove useless, and Baron Struker zapped her. With Hook and Hades down Ursula deserted her allies and the team and went back in the sea.

Vs Abomination

She Gathered the octopens and then was attacked by Abomination. He broke their tridents and they fled away. Ursula then zapped him out of the sea and into the air. She then came across King Triton and smiled. Later she has beat Triton and has the Trident.

Death

Doc Oct and Electro came to get the trident. Ursula having it was ready for them. Electro zapped her and blew her poopsies. In rage she grew and zapped Doc Ock hurting him badly. Electro zapped his power and killed Ursula.