Beware of spoilers for Cosmos in the Lostbelt #4: Yuga Kshetra down below.
Arjuna's Berserker variant has officially been released for summoning, and it's given us the alias by which he is presented: Arjuna Alter. Therefore, I would like to suggest two things:
1. The tag arjuna_(berserker)_(fate) should be renamed to arjuna_alter_(fate). This one should be self-explanatory. The former tag could become an implication for the latter.
2. The creation of arjuna_(fate)_(all) as an all-encompassing tag denoting all variants of Arjuna, as has been done with e.g. Jeanne and Nero.
It'd be much appreciated to see some more opinions on the matter, since it'd be awkward if Arjuna Alter weren't tagged as such like the other Alter Servants. Thank you for reading.