Eaglekit - Brother [Name can be changed if adopter would like]
Appearance: Completely up to adoptee. Probably would be best if he were black and brownish.
Personality: Completely up to adoptee. Would absolutely love if he was the one that helped Rabbitkit with her speech issues and understood her the best. [He could decifer her speech the easiest and know what she wants].
Other: He is the youngest of the first litter and is five and a half moons. He could have been relieved that Rabbitkit was born to take all the pressure of being the youngest kit/most immature, or he could resent her for it. Obviously he is a tom and is in ShadowClanl be apprenticed with Sootkit very soon.
To better help with history, you can look at both Rabbitkit and Sootkit's bio. Sootkit's would be more of a better idea since he's from the same litter.