Very easy answer for me. My main, a magsorc, can stay. He is also my only crafter and gets 99% of my playtime anyway. Deleting the rest will hardly change anything for me.
If he would get deleted however it would be game over for me.
I selected the class of my main, on my main account, but...
Yes, you read that right. I have four accounts. Two of them are maxed out on alts (15), and then I realized it was cheaper to just buy new accounts than to continue buying new character slots. Sure, I'll have to level them, but whatever.
This is impossible to answer truthfully. The character I am most attached to, who did all the questing in the beginning, and who is my crafter, is my Nord stam DK. I might very well save her, but since you asked only by class, I find my magblade the most versatile, and my go to character for solo PvP, which is mainly what I do.
My mag templar Malcemo is my first toon and will never delete until the servers die. A Master crafter,interior decorator, achievement hunter,brigadier in Pvp and Pve dungeon healer. The jabs, jabs, jabs and breath of life never gets old.
I'm saving my magplar. She is my main, my master crafter, and my favorite character. She knows almost all motifs, recipes, blueprints and she is the achievement chaser. I would never get rid of her!
Like most my primary character who I started with. Primary crater, most achievements is a mag sorcer who I managed to get right from the onset etc.
I think it would have been interesting to see what people's answer would have been if all there characters had the same achievements, crafting etc and what class / type people would choose to save then.
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"I am a nightblade. Blending the disciplines of the stealthy agent and subtle wizard, I move unseen and undetected, foil locks and traps, and teleport to safety when threatened, or strike like a viper from ambush. The College of Illusion hides me and fuddles or pacifies my opponents. The College of Mysticism detects my object, reflects and dispels enemy spells, and makes good my escape. The key to a nightblade's success is avoidance, by spell or by stealth; with these skills, all things are possible."