Calvin Rankin aka Mimic acquired his mutant ability when there was an accident happened in his father's laboratory which most of them are dangerous experiments and he was there when the event happened.He was first an enemy of X-Men which he later joined them and was a deputy leader of the team.Source here

image sourceHe can mimic other mutant and gain a copy of its knowledge, skills and powers.His mimic abilities has a range, if the one he is copying is out of range, he will then lose the ability of the copied mutant. Aside from copying he gained permant powers of the orgina X-Men. He can also copy normal humans which he can get their personality traits, skills and intelligence.Source here
| Power Statistic | Level |
|---|---|
| Intelligence | 2 |
| Strength | 4 |
| Speed | 3 |
| Durability | 3 |
| Energy Projection | 4 |
| Fighting Skills | 3 |
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So amazing to know someone who knows these characters. Its just awesome. It drives me to do a research more about xmen.
Thank you @robin-ho
yes, there are still many x-men who are yet not exposed to popularity @leebaong