Getting Started in Blue Protocol: Star Resonance

Class selection matters less than in a typical MMO — you can switch later via a mid-game quest with Milia, the Class Guide at the Pioneer Bureau, though it costs resources and the expensive Hero's Radiance item.
Heavy Guardian is the most beginner-friendly class if you want to tank, thanks to guaranteed blocks and top-tier damage reduction.
Battle Imagines are summonable companions crafted from materials like Primordial Core — worth investing in early since they buff you or attack directly in combat.
Character customization (face, hair, voice, outfit) can be revisited later, so don't over-agonize over your first creation screen.