Life As a Support Mage of The Protagonist

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Ian and Kell, two people. One is introverted bookworm while the other is an extroverted jock. Their personality differs greatly yet they are best friend.
Well, one of them adopted the other and would not left his side.
Yet, a tragedy soon caused them both to lose their life. Taking a pity for their lifespan being cut short, a god decided to give them a chance to live their life in another world, with system for both of them to make their life easier.
While Kell get the Weapon Grand Master System, a system meant for a main character, Ian get the Support Mage System, one meant for sidekick of said protagonist.
With their system, would the two friends able to live their life to the fullest in the world of Fral.

-x-

"With my system, I can do what I like the most without getting any attention,"
...
"Wait, why are you telling me now I am inside the most powerful Avari in the world?! Are you telling me that the picture think I am the sidekick of that big oof?! That is humiliating even if it is kind of true! Where is that big oof?! I would like to have a talk with him!"
...
"Achoo! "
"Bless you,"
"That is weird, why did I sneeze suddenly?"
"Maybe someone talking about you?"
"Yeah, that must be it,"