"U w0t m8???"

About the sticker:
The topmost kanji (忍) means "to endure". It's based on the kanji for heart and the kanji for "knife" above it.

愛 means affection or love.
羅 can mean a net or a kind of light textile fabric. I have no idea why they would use it here unless I'm missing something or they used it for its phonetic.
武 is used to represent many terms as warrior, ferocity, etc. It has also been used to signify the exact opposite, "to end hostilities".
勇 stands for courage.

There could be more to it, like playing with their readings, but I can't tell.

Chucu said:

About the sticker:
The topmost kanji (忍) means "to endure". It's based on the kanji for heart and the kanji for "knife" above it.

愛 means affection or love.
羅 can mean a net or a kind of light textile fabric. I have no idea why they would use it here unless I'm missing something or they used it for its phonetic.
武 is used to represent many terms as warrior, ferocity, etc. It has also been used to signify the exact opposite, "to end hostilities".
勇 stands for courage.

There could be more to it, like playing with their readings, but I can't tell.

The first kanji is usually pronounced "shinobi". Yes, that "Shinobi". Ninjas (忍者) were known for being patient. As a name, it can also be pronounced "Shinobu ".

As for the rest, 愛羅武勇 can be pronounced "ai-ra-bu-yuu". Say that quickly enough, and it should be self-explanatory.

Moonspeaker said:

The first kanji is usually pronounced "shinobi". Yes, that "Shinobi". Ninjas (忍者) were known for being patient. As a name, it can also be pronounced "Shinobu ".

As for the rest, 愛羅武勇 can be pronounced "ai-ra-bu-yuu". Say that quickly enough, and it should be self-explanatory.

Amazing! Thanks a lot Moonspeaker, and nice name.