finally did some sketch like reference sheet for my own OC Iso. due to my exams, i can`t find any time to just sit and make it clean and detailed( so here is her appearing and short info:  
“Iso can make an impression of being cold-blooded and emotionless, but that’s not exactly so. She have lots of feelings, but mostly they are negative. Despite of her battle skills, Iso has tend to be afraid of sudden noises, crowds of people and some magic creatures that she faces while her travelling out of Equestria. She is not social pony, so she has difficlties with conversations becouse of her slowly communicative reactions. But if somebody wants to be her friend, she will gladly accept that. Also, Iso has strange sence of humor, and her jokes are mostly appears to be cruel and grimdark.  
In the battle her character becomes opposite to her social behave - she easilly go into rage and Iso seems like losed her control, but if her ass is about to be kicked, she can quickly cool down and think tactically. Her magic reserve is not big, but she compensate less count of spells with their strengh and accuracy. The only spell that she can support for a long time is summoning her ice tentacles, which can be used for holding weapons.”