Giving some background info on all 4 here:
1: Blue Planet - Was a gentle person and nature lover who designed the night sky on the 6th floor. He was also a druid.
2: Beast King Mekongawa - Played another game called Aberage with Nishikienrai (Narberal Gamma creator). He almost quit Aberage because he felt he was too unskilled but needed encouragement from Nishikienrai.
3: Whitebrim - Was the chief designer of the homunculus maids.Whos quoted as saying "Maid uniforms are justice!" :D I hear in the real world he was manga artist and the MC from his manga was also a maid lol .
4: Luci★Fer- He was skilled at creating golems including the Lion golem at that spa they bathed at as well as several female golems including the last line of defense on the 10th floor Lemegeton. Which is basically a room with 72 little dug outs for golems minus 5 that were never completed however each is made of special rare metals.
Well there ya go folks choose carefully !