Alright I have one. It's been about 10 years and no moment has ever lived up to this one. It's nothing heroic and probably more of a "You had to be there moment" but I will share nonetheless.
We were playing fantasy D&D in the Hero System. It was fantasy like most other campaigns but with a few changes. Namely, in this GM's world elves elves were about 2-4 feet tall. Anyway I made a 3 ft tall elven sorcerer named Tiax The Mighty (Kudos if you know where my inspiration came from)
He always talked in the third person, and thought he could do anything he wanted. He was delusional and believed that he was all powerful and that everything belonged to him. He had a pony named Tiax II. That pony died and the next one he named Tiax 2 the II etc...
He claimed to be all powerful but among the first things he did when a fight broke out was go invisible and and fly to a safe distance. After that he would throw fire etc... but safety first lol.
If he failed at anything, he claimed that if he *really* wanted to, he could deal with it with a snap of his finger but chose not to because "This amuses Tiax". The system didn't have alignments but I'd cement him at a comfortable Chaotic Neutral. His personality was easy for me. What would happen if someone with the mentality of a 3 or 4 year old had insanely powerful magic at his fingertips? He was never disciplined and learned to (almost always) get his way.
Whenever he entered a town, he would telekinetically roll out a red carpet, magically enhance his voice, and bellow "ALLLL HAILLLL TIAX!" He would use TK to make one person bow and others would bow because that's how people work lol. (In This system powers cost endurance which recovered over time. I didn't have to worry about "blowing" my powers for the day) He wasn't "violent" per se but he would use Telekinesis to make people bow to him, charm people, threaten, posture etc... but was mostly harmless unless his life was threatened. Haha I don't know how many times I introduced myself and then the group offhandedly as my escort, bodyguards, or servants. After a while, they quit objecting lol.
Now that there's some context, the actual story.......
Well one day we were traveling to another town (After being exiled from the town we just left). We actually had a map with marks on all of the places we weren't allowed back to lol (mostly because of Tiax's antics).
The group was traveling on horseback and we were pulling our cart full of treasure. I think there was a new party member because a character had recently died. Tiax was educating this person on the party dynamics AKA everyone there were servants of Tiax. This new party member had the ability to detect magic and that was when everyone realized Tiax had cast his own version of Arcane mark on their foreheads (Something I had told the DM about in secret when he first met them haha) His mark? TM :)
One of the players sarcastically asked Tiax if there was anything that *didn't* belong to Tiax. Somebody then noticed that Tiax the Mighty had plastered TM all over the cart. The party member that actually paid for the cart said
"No, I bought this cart and it is the group's cart."
"No, Tiax's cart"
"Group's cart"
"Tiax's cart"
Everyone in Unison: "GROUP'S CART!"
Everyone thought they finally won an argument with Tiax when I passed a note to the GM
Silence...
BOOM!
The cart explodes in fire as Tiax calmly says "No one's cart"
We had to take a break for about 15 minutes because we were laughing too hard.
Story #2
Same character - different reincarnation. I used to like playing Tiax for a new group to evaluate their level of RP and their comfort level in regard to characters with extreme personalities.
I believe Anzyr was actually the GM for this one. It was 3.5 I believe I was a Sorcerer/Incantrix.
We were attempting to infiltrate a party of some sort. One player turned to me and said (out of character) "Oh god... how are you going to have Tiax blend in/not blow our cover?" I said easy. I'm gonna to Rick James this s$%~. lol I still don't know if people just thought I was a bard telling tales of some badass named Tiax (because I referred to myself in the 3rd person) or if they were just picking up what I was puttin down.
Either way it would have worked out but our hot-headed monk got drawn into a fight lol.