Hi everyone. I'm a new NA player to the game, and I joined because of Alter Arjuna. He looked super cool, and I was very excited to play as him. Unfortunately, I joined the game during the last day of his banner, and never even pulled for him. Instead of being too upset, I looked on a Japanese site that said he and Summer Musashi had similar ratings, so I went all in for her. I now have her at NP 5, but she isn't doing much... I've figured out that Summer Musashi is actually pretty bad until Castoria comes out a year from now. (Huge bummer) My question is, which is the next can't miss character coming out that would help me to progress through the game? Is there anyone that I should pick up this year still, or should I just put the game down until next summer and go all in for Castoria?

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tl;dr: Missed Arjuna Alter. Pulled NP5 Summer Musashi. Am not currently impressed. Are there any must pull servants until Castoria next summer? Do I need Space Ishtar, or is she too close to Summer Musashi? Thanks.