Lionel is one of Gru's Minions.
He is a two-eyed minion that appeared in Despicable Me.
In Despicable Me, Lionel is fixing an overpass in Gru's Lab. At his appearance, he is holding a nail and waiting for Gaetano to knock it in. Gru approaches and announces "Minions, assemble!" and leaves. Lionel has little responce but sighs.
Shortly afterwards, Gaetano rushes back, said "Throo!" (3!) and hit Lionel with the hammer, which makes Lionel screams in pain loudly.