TKデスピサロ vs Papulatus

So why is Shikage a shadow and you aren't o.o

Different Monster Familiars give different effects. Some give visual effects, others give stats like speed, jump, accuracy, avoid, STR, DEX, INT, LUK (no weapon or magic attack buffs, as far as I've seen so far and the STR/DEX/INT/LUK bonuses are not percent based and they give VERY LITTLE stat boosts most of the time), and some even give item and meso drop increases.