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Rerolling

Recommended launch units
File:Student Portrait Hibiki.png	Hibiki is an extremely versatile Special (off-field) unit that sees play in all game modes. Has damage output on par with striker characters. Remains irreplaceable in PVP until Mashiro (Swimsuit) release during half-anniversary, and is still core after. As of half-anniversary she is still not farmable, so pulling her from gacha and investing heavily is recommended.
File:Student Portrait Shun.png	Shun provides skill cost boost at the beginning of combat. Core PVP unit; sees some play in Raids for extra fast clears or as a general purpose Explosive damage dealer. Not farmable as of half-anniversary.
File:Student Portrait Iori.png	Iori has very high damage output at low EX cost. Performs extremely well in PVP and in Raids against Heavy armor bosses. She eventually becomes farmable in Hard 14-3, but having her early on is a very significant headstart.
File:Student Portrait Haruna.png	Haruna, a Mystic damage counterpart to Iori. Just like Iori, her EX can devastate enemy team in PVP; core damage dealer in ShiroKuro raid. She is easier to farm (hard stages 8-3 and 12-3) than Iori, which makes getting Haruna from gacha less of a priority.
Notable mentions
File:Student Portrait Tsubaki.png	Tsubaki is a premier tank, despite being 2-star. Extremely hard to deal with in PVP early on, remains a core PVP unit as of half-anniversary. Isn't farmable, but given rarity you are likely to get her during initial pulls.

File:Student Portrait Maki.png	Maki, obtainable from the raid shop. Provides Defense shred and solid single-target damage output for Heavy armor raidbosses.
File:Student Portrait Serika.png	Serika the 120-yen cat can be bought outright with a starter package or easily farmed. A well-rounded damage dealer, high investment Serika sees play in Hieronymus Raid.
File:Student Portrait Nonomi.png	Nonomi is a free unit provided through starter campaign. Widely used for story content, clearing EXP Commissions, and sees play in Chesed raid. In a pinch, she can be used in PVP early on if you are missing better damage dealers.
File:Student Portrait Kotama.png	Kotama provides valuable Attack buff for your Strikers. Sees a lot of play in Raids.
File:Student Portrait Serina.png	Serina is your primary healer. Extremely versatile and easy to use, she provides excellent single-target healing, 2-cost EX skill can also be used to reposition units. Does not need high investment early on, but becomes increasingly important in later Raid content. Core PVP unit.