what are the nicknames (example Flaming Charisma) and why do the guys have them, (sorry for bad English,)

Because the nickname can describe the characteristic of each member. In kpop, each member should have a characters for mashabiki to remember. I will take the example of Shinhwa: Hyesung is called "a little prince" to describe his mage... In SHINee, Taemin is called Makdongie that describes his image as the youngest member and a cute dongsaeng. Minho has a strong charismatic image and is competitive, that is why he has the nickname "Flaming charisma".... Those names are not aliyopewa kwa fans. They are aliyopewa kwa SM, and mashabiki gradually remember those names of each member.

The Nickname of Onew is Leader, because he is the Leader xD and Minho's sekunde Nickname is prince, because in the reality onyesha Hello Baby he was dressed as a prince xD Key is know as "almighty" Key. And Jonghyun call hiself as "BlingBling" I'm not sure that jonghyun calls bling bling kwa hiself but I think he alisema it in a show... So Taemin is called Maknae... beacause... he is the Maknae xD when wewe understand german I can translate it for you^^ my englisch is not really good too xD

Im sure the other guys already answered the swali for what their nicknames are so I'll just tell wewe the reason for them! So before their debut the company came up with nicknames like how Super Junior used when they first debuted also.

Its to separate their charms
"Flaming Charisma"= sporty, Competitive
"Bling Bling"= So much talent, clean high notes
"Almighty Key"= Many hidden charms he likes to keep hidden
"Maknae Taemin"= ....youngest lol
"Leader/dubu"= Leader... because hes the leader and dubu because he has a soft voice and he also looks soft

:) hope this helps

Onew: Onleader Onew
Jjong: Bling-bling Jonghyun
Key: Almighty Key
Minho: Flaming Charisma
Taemin: Maknae Taemin

The meaning of the flaming charisma is zaidi competitive and talented,Bling Bling means having zaidi talents,master (almighty)key means having solutions
for all the problems,tofu leader means a good and talented leader and last but not the least mankae taemin meaning is a cute,innocent and powerful guy. Since these meanings accompaning them i support them in these nicknames.These nicknames is also give a special outlook for them