Wario

Meeting Waluigi
Wario used to be a massive fan of Mario. Waluigi used infection on him to create a distraction for Mario, causing Super Mario Land 2: 6 Golden Coins.

Death(s)
Wario has died at least 10 times so if you called The Wah War "That time Wario died", everyone would tell you to specify.

Here is a list of Wario's deaths
 * Executed by JonTron (start of the Wah War)
 * Suicide
 * Thrown out of Mario's Castle (by Mario)
 * Stabbed 37 times in the chest by Luigi
 * Killed by Waluigi (In an unspecified manner, Waluigi was angry that day)
 * Victim of the Thanos Snap

There are more deaths. The most important thing is that Wario still lives today and was revived using the Wah-Ji Board.
 * Died in service during the Wah War