“Re: Aether Raids Starting from Zero” series is pretty inspirational:

To sum it up (spoilers)…

1000 (pronounced “sen”) did a Nuzlocke challenge of starting a fresh new account to climb Aether Raids to tier 21.

Conditions:
-No gacha units (there were a few exceptions for quests that he covers, like accidentally claiming a Jagen copy from Three Heroes quests… and he of course made sure to not actually use them), you see at the end of his challenge he has well over 1k orbs
-No gacha skill inheritance
-Using feathers for 5* allowed
-Refines, seals, increasing potential allowed
-No merges

Therefore, he had no Astra units, only Light from Eir and Peony.
Andddd… he did it without losing tiers, in the span of 2 months – 56 days!

His main goal in doing this series is to inspire more people to play FEH and Aether Raids by proving that it can be done with the extreme bare amount of resources that he used.

In his last video, he does an ending credits roll like they do in the main FE games, summarizing the kills and deaths of each unit. Through this you can see bits of his fun sense of humor as a fellow FEH player. Translated below:

Ninian
2 wins, 0 losses
Worked as a second dancer. Has defeated Altina once.

Eirika (Cav Mage)
3 wins, 0 losses
Served as a solution for fighting against Surtr. Unfortunately did not get to fight as much as desired.

Peony
5 wins, 4 losses
Served as dancer and Mythic Hero. Gentle Dream and Aerobatics did a lot of work. Flower of Joy’s cardinal effect was also great help.

Alfonse
6 wins, 1 loss
The main character who only appeared during his bonus seasons. As a 4*, he did damage to Surtr and worked surprisingly well. No one knows where he went after his bonus season was over.

Sharena
7 wins, 2 losses
Like her brother, only appeared during her bonus seasons. It’s the Sharena you all know. No one knows where she went after her bonus season was over.

Anna
8 wins, 3 losses
Had more bonus seasons than everyone else, so got to appear more often. As the only member who got their weapon refined, Nóatún movement capabilities might have been a good help.

Ike (Legendary)
26 wins, 0 losses
Was a great help when the fortress level differences were advantageous. After that advantage was gone, he lost his opportunities to get used. However, he’s been doing the most work in collecting orbs.

Fjorm
46 wins, 1 loss
Did a lot of work with the fortress level advantage. Appearances decreased as the advantage disappeared. Has since done work in main story chapters and BHBs for collecting orbs.

Clarisse
73 wins, 3 losses
This would’ve been impossible without her… She put in work on a different dimension. Because she appeared late and her main role was to lower HP, she didn’t have many kills, but there is no doubt that she put in the most work out of any unit.

Reinhardt
104 wins, 6 losses
No explanation needed

Eir
116 wins, 4 losses
Although she was a Mythic hero, she has the most kills and proved herself as an attacker. She was also very powerful as a support unit, a unit with no faults. Summoner threatened her into making a contract with him.